EP0333011B1 - Machine for hot-printing on paper and foil substrates - Google Patents

Machine for hot-printing on paper and foil substrates Download PDF

Info

Publication number
EP0333011B1
EP0333011B1 EP89104088A EP89104088A EP0333011B1 EP 0333011 B1 EP0333011 B1 EP 0333011B1 EP 89104088 A EP89104088 A EP 89104088A EP 89104088 A EP89104088 A EP 89104088A EP 0333011 B1 EP0333011 B1 EP 0333011B1
Authority
EP
European Patent Office
Prior art keywords
heater
skirt
rollers
heat
machine according
Prior art date
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.)
Expired - Lifetime
Application number
EP89104088A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0333011A2 (en
EP0333011A3 (en
Inventor
Vittorio Vigano'
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
VITTORIA INDIRIZZI CONPIT S.R.L.
Original Assignee
VITTORIA INDIRIZZI CONPIT Srl
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 VITTORIA INDIRIZZI CONPIT Srl filed Critical VITTORIA INDIRIZZI CONPIT Srl
Publication of EP0333011A2 publication Critical patent/EP0333011A2/en
Publication of EP0333011A3 publication Critical patent/EP0333011A3/en
Application granted granted Critical
Publication of EP0333011B1 publication Critical patent/EP0333011B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F31/00—Inking arrangements or devices
    • B41F31/002—Heating or cooling of ink or ink rollers

Definitions

  • the invention relates to a machine for hot-printing on paper and generic sheet substrates, such as light cardboard, plastics sheets, and the like.
  • the paper is liable to become wet in the areas subjected to the liquid ink in a cold condition, and result in smearing, staining, or fouling during its passes over the rollers or the color superimposition steps.
  • the paper is quickly dried either by hot air or another means such as UV or IR light, to vaporize off the pigment carriers or solvents. Large fans in a heated enclosure may also be used.
  • the paper drying always brings about a number of problems. In fact, since a non-uniform ink application may occur, the dried paper may be just too dry locally, in view of that the drying process to vaporize off the pigment carriers or solvents also changes the optimum relative humidity of the paper, to inhibit in some cases a good further printing in at least four colors.
  • Excess drying may also trigger static electricity phenomena, with resulting sparking, fire, and explosion hazards.
  • Comparable phenomena may also occur with substrates other than paper. Paper, moreover, cannot withstand the mechanical stresses to which it is subjected due to excessive dryness, and break.
  • the extent of the drying process should be controlled in drying systems to suit the amounts of paper to be dried, so as to prevent, for example, a break in the supply of paper from causing excessive drying of paper already in the heating step, with attendant fire hazards.
  • a first type apparatus only permits of transfer printing because it provides for ink to be transferred from a transfer substrate, over which it has been pre-coated, to a paper or plastics substrate bearing an adhesive.
  • the adhesive on the paper or plastics substrate is caused to swell by heating so as to block the ink of the transfer substrate, as pressed onto the substrate to be imprinted.
  • the transfer substrate is left clean and ink-less on completion of the printing step.
  • This first type apparatus has a low output because it is capable at most of delivering approximately 1800 printed pieces per hour. Furthermore, and above all, it does not allow of four-color printing or superimpositions of inks, and is often prone to smearing.
  • a second type apparatus see e.g. US-A-2 268 594 provides for the use of rotating rollers which are heated by means of stick electric resistance heaters, or by oil, or steam.
  • the stick resistance heaters placed inside the rollers to be heated, tend to distort and have a high thermal inertia, that is, are slow to change the magnitudes of the heat exchanges.
  • the thermal inertia of the sticks is also enhanced by the surrounding air.
  • the oil circulated through the roller interiors cannot be heated to a temperature above 150°C to avoid the risk of cracking and therefore there are provided on the roller outside, which delivers its heat to the paper in rotating, top temperatures of about 100°C, oftentimes inadequate for many heat-fusable inks.
  • the rollers must be rotated at very low rates, so as to dissipate little heat. but in that case the production output decreases considerably.
  • the heated and pressurized steam circulated through the roller interiors enables temperatures not above 120°C to be reached on the roller exteriors.
  • problems are often encountered with the seals which seal off the enclosure defined by the roller.
  • the cited known second type apparatus equipped with heated rotating rollers, disallows thermal control of the rollers both in the respect of the achievable temperature value and control of its variations. It is for this reason that said apparatus is restricted to applications which require no high printing accuracy, such as for making chemical or carbon transfer papers, which merely involve the printing of covering substances.
  • heat is only supplied for melting the ink or heat-fusable coloring substance, and to maintain it at suitable temperatures during its transfer to paper.
  • heat is supplied over the entire printed material until the excess liquid is vaporized off and the necessary drying accomplished.
  • the technical task underlying this invention is to provide a machine for hot printing on paper and foil substrates which can substantially obviate the cited drawbacks of cold printing and permit of hot printing even where high printing accuracy and output are required.
  • a machine for hot printing on paper and foil substrates comprising, on a frame: melting members adapted to hot melt heat-fusable substances, hollow rollers having a cylindrical outer skirt and being adjacent to said melting members and adapted to transfer said heat fusable substances to one said foil substrate being moved past said rollers, heater devices for heating at least some of said rollers characterized in that said heater devices comprise sequentially arranged heater bands inside each heated roller and in contact with said skirt, each of said heater bands being located in a specific zone of said skirt and including electric resistance heaters powered separately from the power supply to the other said heater bands, and deflector rolls for said foil substrate located downstream of said rollers, and cooling devices for cooling at least some of said deflector rolls.
  • the hot printing apparatus or machine is indicated at 1 in Figure 1.
  • the machine or apparatus 1 comprises, mounted on a holding frame 1a, a number of deflector members and in particular some deflector or advancing rolls 2 provided for entraining and conveying paper 3, or any other foil substrate, directly after the same has been subjected to the printing operations.
  • rollers 4 Upstream of the deflector rolls 2, there are rollers 4 in the printing zone for transferring heat-fusable substances 5c to the paper 3 or else.
  • the rollers 4 comprise a first roller 4a which transfers the heat-fusable substances from melting members 5. The latter are effective to hot melt the heat-fusable substances and comprise a tray 5a equipped with resistance heaters ( Figure 1).
  • the tray 5a is overlaid by a doctoring blade 5b contacting the first roller 4a and adapted to restrict the transfer of heat-fusable substances 5c.
  • the rollers 4 also comprise a second roller 4b contacting the first roller 4a, and a third pressure roller 4c which clamps the paper 3 between the third roller 4c and second roller 4b.
  • cooling devices 2a preferably comprising water circulation circuits and spray nozzles for water to be vaporized.
  • These cooling means 2a may be implemented by technical solutions known per se, and are therefore no further described in detail herein.
  • the heat-fusable substance transfer rollers 4 are instead equipped, at least in part, with heater devices 6 placed inside the rollers 4 in contact with a cylindrical metal wall or skirt 7.
  • the latter is of reduced thickness and has a high thermal conductivity and constitutes, along with removable head pieces 8, the load-bearing shell of each roller 4.
  • the heater devices 6 it is expediently arranged for the heater devices 6 to be subdivided into a plurality of heater bands laid side-by-side along a parallel direction to the main dimension of the rollers 4, and each band has a thermal control independent of the thermal controls for the other bands.
  • the heater devices 6 are subdivided into three heater bands 6a with independent thermal controls, each in contact with a zone of the skirt 7, and engaging in combination the entire skirt 7.
  • the heater bands 6a have uniform thicknesses and are preferably contiguous so as to form a single carpet, as shown in Figure 4. They are formed from a flexible insulating material 9, e.g. silicone, encapsulating electric resistors 10 which are defined by a flexible electric cable bent over and laid such as to leave no empty spaces in each heater band 6a. Electric power supplies are provided separately for each heater band 6a.
  • each heater band 6a there are also provided heat sensors 11, such as thermocouples, capable of sensing the temperature and supplying a signal to a control member 12 ( Figure 5) adapted to change the amount of the current input to the resistors 10.
  • the control member 12 it is advantageously arranged for the control member 12 to comprise switch elements, known per se, effective to change the amount of current by alternating conditions of maximum input to breaks in the input. In this way, not only is the initial transition period minimized, but also the demand for local heating is met in a rapid and simple manner, that is heating restricted to a given heater band 6a can be selected where required to deliver more heat owing to the presence of a larger amount of heat-fusable substances thereat.
  • the heater devices 6 are held in contact with the skirt 7 by holder means 13, and the latter are brought out in two preferred embodiments thereof.
  • the holding means 13 are a layer of a heat-insulative concrete material 14 cast to a uniform thickness by centrifuging inside the roller 4 a mass of said material in a flowing state.
  • the holding means 13 are defined by a plate wall 15 made of an aluminum alloy.
  • the wall 15 has corrugations 16 defined by stiffening folds, each laid into a ring substantially concentrical with the skirt 7.
  • the corrugations 16 come into contact with the layer 9, and accordingly, the wall 15 defines, in cooperation with the layer 9, a space 17 containing air. Thus, a heat insulating barrier to the roller 4 interior is created.
  • the outer surface 18 of the wall 15 facing the resistors 10 is suitably coated or treated to provide high heat reflectivity characteristics. For example, it may be mirror finished or polished.
  • the inner surface 19 of that same wall 15 is instead of a dull type. In this way, the heat generated by the resistors 10 is mostly confined to a region close to the skirt 7 by both the space 17 preventing transfer by conduction and the reflective action of the outer surface 18 preventing transfer by radiation.
  • the wall 15 is subdivided into substantially annular, consecutively side-by-side modules which facilitate the assembling of the wall 15 and are adaptable to fit rollers 4 with different lengths.
  • locating elements inwardly of the wall 15 which comprise a plurality of struts 20 effective to urge the wall 15 in a direction toward the skirt 7.
  • Each strut 20 comprises a bracket element 21 through-penetrated by a screw element 22 which define in combination three active lugs 23 contacting the wall 15.
  • a pair of locknuts 24 and third nut 25 Associated with the screw element 22 are a pair of locknuts 24 and third nut 25 defining a movable body for use to balance the rollers 4.
  • the skirt 7 of at least some of the rollers 4 are engaged externally, as by means of a highly adhesive glue, with a plastics covering 26 ( Figures 5-8), e.g. of the type known in the trade by the name of "Nilograph".
  • This covering has its outer surface screened and etched to delineate the zones to be printed and to facilitate transport of heat-fusable substances.
  • the plastics 26 is advantageous in that it can be removed and enables the same rollers 4 to be used for different printing operations.
  • a separating element 27 defined by a headless screw or set screw adapted to urge by its tip a flap of the plastics 26 away from the skirt 7, thus facilitating its full removal whenever in need of replacement.
  • the heat-fusable substances in the tray 5a are formed, for example, by pigments and microcrystalline waxes and indicated at 5c.
  • the heat-fusable substances may be a mixture of, powdered aluminum, known as "Argento 177", or alternatively, "Bronzo Pallido 17", to an amount of at least fifty percent; low-density polythene, known as "Eltene 15”, to an amount of up to five percent; high-density polythene, known as "Eltene 25”, to an amount of up to twenty percent; and a glue, microcrystalline wax, and polythene composition, known as "Luna Melt LM 400", to an amount of up to twenty five percent.
  • suitable heat-soluble substances for use with the machine or apparatus according to the invention, comprises a mixture of, homogenized pigments to an amount of up to fifty percent; high density polythene to an amount of at least twenty five percent; and a high-melt microcrystalline wax composition, known as "Sepa Melt 87/B", or at any rate having a viscosity of about 2000 cps at 170°C, to an amount of up to twenty five percent.
  • the invention achieves important advantages.
  • the temperatures of the rollers 4 is controlled in a simple and highly accurate fashion, sector by sector.
  • rollers 4 The specific structure of the rollers 4 is advantageous in that the heat provided by the resistors is nearly all available to the roller exteriors, for the hot printing process, while minimizing the loss of heat to the roller centers. This also results in a high capability for fast changes of temperature at the paper or substrate during the printing process.

Landscapes

  • Laminated Bodies (AREA)
  • Printing Methods (AREA)
  • Heat Sensitive Colour Forming Recording (AREA)
  • Making Paper Articles (AREA)
  • Non-Metallic Protective Coatings For Printed Circuits (AREA)
  • Electronic Switches (AREA)
  • Manufacturing Of Printed Wiring (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)
  • Supply, Installation And Extraction Of Printed Sheets Or Plates (AREA)
  • Rotary Presses (AREA)
  • Ink Jet (AREA)
EP89104088A 1988-03-15 1989-03-08 Machine for hot-printing on paper and foil substrates Expired - Lifetime EP0333011B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT8819780A IT1216094B (it) 1988-03-15 1988-03-15 Genere. apparato per la stampa a caldo su carta e supporti laminari in
IT1978088 1988-03-15

Publications (3)

Publication Number Publication Date
EP0333011A2 EP0333011A2 (en) 1989-09-20
EP0333011A3 EP0333011A3 (en) 1990-12-12
EP0333011B1 true EP0333011B1 (en) 1994-12-28

Family

ID=11161159

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89104088A Expired - Lifetime EP0333011B1 (en) 1988-03-15 1989-03-08 Machine for hot-printing on paper and foil substrates

Country Status (7)

Country Link
EP (1) EP0333011B1 (it)
JP (1) JPH0214146A (it)
AT (1) ATE116206T1 (it)
DE (1) DE68920173T2 (it)
ES (1) ES2067491T3 (it)
IT (1) IT1216094B (it)
NO (1) NO891089L (it)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4439007C2 (de) * 1994-11-02 1997-04-30 Schmidt Gebr Druckfarben Druckverfahren
DE10001764A1 (de) 2000-01-18 2001-08-02 Koenig & Bauer Ag Farbauftrageinrichtung
TWI409176B (zh) * 2010-12-31 2013-09-21 E Ink Holdings Inc 電熱轉印裝置以及電熱轉印方法
CN105346216A (zh) * 2015-09-29 2016-02-24 重庆市曲叶科技有限公司 车牌热转印机的加热罩上辊组件
CN108944008A (zh) * 2018-09-26 2018-12-07 浙江码尚科技股份有限公司 一种软包装贴签用热转印加热装置

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE137401C (it) *
US2268594A (en) * 1939-08-03 1942-01-06 Huber J M Inc Process of letterpress printing
US2337386A (en) * 1940-09-23 1943-12-21 Interchem Corp Printing press and method of printing therewith
GB1040743A (en) * 1962-05-29 1966-09-01 Caps Res Ltd Improvements in electrically heated rollers
FR1356727A (fr) * 1963-05-14 1964-03-27 Procédé d'impression et appareil correspondant

Also Published As

Publication number Publication date
JPH0214146A (ja) 1990-01-18
ATE116206T1 (de) 1995-01-15
EP0333011A2 (en) 1989-09-20
IT1216094B (it) 1990-02-22
EP0333011A3 (en) 1990-12-12
IT8819780A0 (it) 1988-03-15
NO891089L (no) 1989-09-18
DE68920173D1 (de) 1995-02-09
ES2067491T3 (es) 1995-04-01
NO891089D0 (no) 1989-03-14
DE68920173T2 (de) 1995-06-22

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