US3859494A - Device for drying wet coatings applied to substrates of low electrical conductivity - Google Patents

Device for drying wet coatings applied to substrates of low electrical conductivity Download PDF

Info

Publication number
US3859494A
US3859494A US461789A US46178974A US3859494A US 3859494 A US3859494 A US 3859494A US 461789 A US461789 A US 461789A US 46178974 A US46178974 A US 46178974A US 3859494 A US3859494 A US 3859494A
Authority
US
United States
Prior art keywords
electrodes
row
electrode
drying
spikes
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
US461789A
Other languages
English (en)
Inventor
Walter Spengler
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Application granted granted Critical
Publication of US3859494A publication Critical patent/US3859494A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06C—FINISHING, DRESSING, TENTERING OR STRETCHING TEXTILE FABRICS
    • D06C7/00—Heating or cooling textile fabrics
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06C—FINISHING, DRESSING, TENTERING OR STRETCHING TEXTILE FABRICS
    • D06C2700/00—Finishing or decoration of textile materials, except for bleaching, dyeing, printing, mercerising, washing or fulling
    • D06C2700/09—Various apparatus for drying textiles

Definitions

  • the invention relates to a drying device for drying wet coatings applied to substrates of low electrical conductivity comprising a series of parallel spaced-apart first electrodes of rod-like form between which is located a row of upstanding electrode spikes defining a second electrode. HT voltage is applied between the first and second electrodes and dries the coating on the substrate as it passes close to the electrode array.
  • Sheets-Sheet 2 This invention relates to a device for drying wet coatings applied to substrates of low electrical conductivity.
  • the present invention provides a device whereby the drying time for wet coatings applied to substrates of low electrical conductivity, can be reduced to such an extent that it becomes of the same order of magnitude as the time required for applying the coating. It is therefore an object of this invention to make possible the production of a product with at least one coating applied on a substrate of the type referred to, which leaves the coating device or printing machine all ready for dispatch.
  • a device for drying wet coatings applied to substrates of low electrical conductivity comprises a. a plurality of first electrodes in the form of elongated rod-like electrical conductors disposed in parallel spaced relationship,
  • a plurality of second electrodes in the form of pointed spikes extending substantially perpendicular to the first electrodes and arranged in at least one row with the or each row extending between each adjacent pair of first electrodes, such that the pointed ends of the spikes in each row are virtually equidistant from the adjacent pair of first electrodes, and with the pointed end of the spikes situated virtually in the same plane as the pair of first electrodes,
  • HT generating means for maintaining a voltage difference between the first and second electrodes
  • retaining means which supports both the first as well as the second electrodes, said retaining means defining a surface electrically insulated from the first electrodes which surface confronts the first electrodes and above which the second electrodes project.
  • Each of the first electrodes is preferably surrounded by a tube of vitreous silica which envelops its electrode at least throughout its effective length.
  • the first electrodes may be connected either in parallel or in series to the HT generating means.
  • the retaining means may be a base plate common to the first and second electrodes and consisting of an electrically insulating material, which base plate can be incorporated in the coating or printing machine which is to be provided with the drying device of the invention.
  • FIG. 1 shows, in diagrammatic representation, a printing machine comprising an assembly of printing units with, interposed therebetween a plurality of drying devices in accordance with the invention
  • FIG. 2 is a plan of one embodiment of drying device in accordance with the invention.
  • FIG. 3 is a sectional view along the line III/III of FIG. 2, and
  • FIGS. 4 and 5 are diagrammatic representations explaining the mode of operation of drying devices in accordance with the invention.
  • the reference numerals l, 2, 3 and 4 denote four printing units following upon each other in the direction a sheet 5 travels through the machine.
  • these units are merely indicated in each case by an ink fountain (ll, 21, 31 and 41), a form roller (12, 22, 32 and 42), a printing cylinder (13, 23, 33 and 43) and a back pressure cylinder (14, 24, 34 and 44).
  • Each sheet 5 travels on a table 15, provided at least between the printing units l-4.
  • Apertures 16-19 are provided in this table which correspond to the working area of each of four drying devices 7, 8, 9 and 10.
  • Each of the drying devices 7-10 comprises a number of parallel tubes 25-28 of vitreous silica, four in the present case, containing a wire or rod-like conductor 29 which forms an electrode.
  • this wire or rod-like conductor is either threaded through all tubes in one piece, or separate conductors are used in each, the wire or rod ends projecting from the ends of each tube being connected in series or in parallel.
  • FIG. 2 shows a onepiece wire 29 threaded through the cores of the four tubes 26-28.
  • the free end 30 at the left extremity of the tube 25 serves as a connection to a high-tension line (not shown).
  • the ends of the tubes 26-28 are embedded in, or clamped by, electrically insulating retaining means 35, 36.
  • the tubes are unsupported between the retaining devices 35, 36, the latter being in the form of blocks of electrically insulating material which surround the bare wire sections beyond the tube ends and prevent sparkover to adjacent metal parts.
  • the insulating properties of the devices 35, 36 can be dispensed with by employing a continuous electrically insulating tube extending the total length of the wire and bending the tube through at the points corresponding to the ends of the runs indicated by the individual tubes in FIG. 2. This offers advantages from the point of view of electrical insulation.
  • the devices 35, 36 are integral with a base plate 37 of electrically insulating material in which metal bars 38, 39 and 40 are embedded. These metal bars are provided with corona point electrodes 45 in the shape of narrow-pointed spikes inserted along the longitudinal axis of each bar at equally spaced intervals.
  • the bars 38-40 locate in grooves in the base plate 27.
  • the pointed electrodes 45 project above the base plate 37, extending through upper parts of the grooves which are filled with an electrically insulating compound 46 up to the level of the upper surface of the plate 37.
  • the bars are interconnected by means of a strap 48 of good electrically conducting material which is tightened against the underside of the base plate 37 by means of nuts screwed to at least one of the connecting bolts 47.
  • the connecting bolts 47 may also be used for mounting the drying equipment on a conductive or insulating support (not shown).
  • each drying device can be varied depending on the number of tubes 25-28 extending across the direction in which each sheet travels through the machine. These tubes may be arranged either on a single or (as shown in FIG. 1) on several separate base plates.
  • the drying equipment illustrated in FIGS. 2 and 3 which is equipped with four tubes, is therefore by no means limiting.
  • the number of tubes or electrodes 29 depends upon the maximum drying power required at a drying point and their distribution among separate base plates 37 is undertaken with a view to operating requirements such as easy cleaning and disassembly, as well as power regulation by switching individual tubes.
  • the operation of the above-described drying device is based on the following phenomena (see FIG. 4): If a pair of long, virtually parallel electrodes 51, 52, each enveloped by insulating material 53, is connected to one terminal of a high-voltage source and a second electrode'in the shape of a slim metal spike with one pointed end 54, virtually on the same level as the electrodes 51, 52 and situated in the centre between these electrodes, is connected to the other terminal of this high-voltage. source, then corona discharges are set up between the electrodes 51, 52 and the point electrode 54. These discharges follow the paths indicated in FIG. 4.
  • An array of four vitreous silica tubes each of approximately 5 mm outer diameter, each having a wall thickness of approximately 1.5 mm and arranged as shown in FIG. 2 with an overall width b of approximately 50 mm, is capable of drying ink layers on art paper of approximately g/m travelling at a velocity of approximately 10 cm/s, to the point of being wipe-resistant.
  • the operating speed depends upon the thickness of the applied coating and the thickness of the substrate and may be improved by increasing frequency and the applied voltage.
  • the wet ink lights up in the manner of a St. Elmos fire.
  • the above-described equipment is suitable for the drying of any wet coating such as ink, glue etc. on a substrate of low electrical conductivity such as paper, card, or a textile material.
  • a device for drying wet coatings applied to substrates of low electric conductivity comprising a. a plurality of first electrodes in the form of elongated rod-like electrical conductors disposed in parallel spaced relationship,
  • a plurality of second electrodes in the form of pointed spikes extending substantially perpendicular to the first electrodes and arranged in at least one row with the or each .row extending between each adjacent pair of first electrodes, such that the pointed ends of the spikes in each row are virtually equidistant from the adjacent pair of first electrodes and with the pointed end of the spikes situated virtually in the same plane as the pair of first electrodes,
  • HT generating means for maintaining a voltage difference between the first and second electrodes
  • retaining means which supports both the first as well as the second electrodes, said retaining means defining means defining a surface electrically insulated from the first electrodes which surface confronts the first electrodes and above which the second electrodes project.
  • each of the first electrodes is surrounded by a tube of vitreous silica which envelops the first electrode at least throughout its effective length.
  • a device in which the first electrodes are connected in series to the HT generating means.
  • a device in which the plurality of first electrodes is formed from bent-back runs of a one-piece electric conductor.
  • a device in which the said one-piece electric conductor is enveloped by a vitreous silica tube throughout its entire length.
  • a device in which the second electrodes are arranged at virtually uniform intervals in the or each row, the or each of the rows of second electrodes being supported by an electrically conductive bar.
  • the retaining means comprises a base plate and end blocks of electrically insulating material.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Drying Of Solid Materials (AREA)
  • Discharge Heating (AREA)
US461789A 1973-04-18 1974-04-17 Device for drying wet coatings applied to substrates of low electrical conductivity Expired - Lifetime US3859494A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH559673A CH568798A5 (da) 1973-04-18 1973-04-18

Publications (1)

Publication Number Publication Date
US3859494A true US3859494A (en) 1975-01-07

Family

ID=4296248

Family Applications (1)

Application Number Title Priority Date Filing Date
US461789A Expired - Lifetime US3859494A (en) 1973-04-18 1974-04-17 Device for drying wet coatings applied to substrates of low electrical conductivity

Country Status (10)

Country Link
US (1) US3859494A (da)
JP (1) JPS5423456B2 (da)
CA (1) CA976618A (da)
CH (1) CH568798A5 (da)
DE (1) DE2417441C2 (da)
DK (1) DK146349C (da)
FR (1) FR2226630B1 (da)
GB (1) GB1443265A (da)
IT (1) IT1009470B (da)
SE (1) SE389059B (da)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4242805A (en) * 1978-07-07 1981-01-06 Service D'exploitation Industrielle Des Tabacs Et Des Allumettes Method and apparatus for drying a thick wet layer coated on one face of a cardboard sheet
US4359826A (en) * 1980-03-21 1982-11-23 The Mead Corporation Drying system
US4574413A (en) * 1983-08-08 1986-03-11 Otting International, Inc. Methods and apparatus for employing electrical conductivity for fixing dye to carpets

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CS214960B1 (en) * 1979-12-19 1982-06-25 Miroslav Dolezal Method of thermal manipulation of the band material particularly textile and facility for performing the same
JPS6051808U (ja) * 1983-09-19 1985-04-11 市光工業株式会社 車輌用灯具のプロテクタ−取付け構造
JPS6088316A (ja) * 1983-10-20 1985-05-18 Omron Tateisi Electronics Co ロ−タリエンコ−ダの回転変位計測装置
DE4106573C1 (en) * 1991-03-01 1992-07-16 Josef Prof. Dr.-Ing. 8200 Rosenheim De Gefahrt Water-based wood varnish drier - applies capacitative stray field to horizontal conveyor of low dielectric loss carrying flat wood pieces or wooden surfaces greater than 500 mm in width
DE19651406C1 (de) * 1996-12-11 1998-06-10 Roland Man Druckmasch Trocknereinheit in einer Druckmaschine

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3404462A (en) * 1966-08-09 1968-10-08 Standard Register Co Dielectric heat apparatus
US3470621A (en) * 1966-05-11 1969-10-07 Fitchburg Paper Co Material treatment apparatus and method using a high frequency field
US3619538A (en) * 1970-03-03 1971-11-09 Ppg Industries Inc Process and apparatus for high-frequency electrical drying of fibrous strand
US3681558A (en) * 1970-06-05 1972-08-01 Siemens Ag Capacitive high-frequency heating apparatus
US3740257A (en) * 1971-09-21 1973-06-19 Ppg Industries Inc Process and apparatus for dielectric heat drying elastomer coated glass fibers

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1900543A (en) * 1930-11-26 1933-03-07 Cochrane Charles Henry Combined ink drying and neutralizing device
DE691038C (de) * 1937-07-01 1940-05-15 Siemens Schuckertwerke Akt Ges Einrichtung zum Trocknen von Papierbahnen und aehnlichen Stoffbahnen
CH372032A (de) * 1959-08-07 1963-09-30 Wuersch Walter Vorrichtung zum schnellen Trocknen von mit Leim versehenen Rücken von Büchern, Katalogen usw.
US3641680A (en) * 1970-06-01 1972-02-15 Robert R Candor Liquid-removing apparatus and method

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3470621A (en) * 1966-05-11 1969-10-07 Fitchburg Paper Co Material treatment apparatus and method using a high frequency field
US3404462A (en) * 1966-08-09 1968-10-08 Standard Register Co Dielectric heat apparatus
US3619538A (en) * 1970-03-03 1971-11-09 Ppg Industries Inc Process and apparatus for high-frequency electrical drying of fibrous strand
US3681558A (en) * 1970-06-05 1972-08-01 Siemens Ag Capacitive high-frequency heating apparatus
US3740257A (en) * 1971-09-21 1973-06-19 Ppg Industries Inc Process and apparatus for dielectric heat drying elastomer coated glass fibers

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4242805A (en) * 1978-07-07 1981-01-06 Service D'exploitation Industrielle Des Tabacs Et Des Allumettes Method and apparatus for drying a thick wet layer coated on one face of a cardboard sheet
US4359826A (en) * 1980-03-21 1982-11-23 The Mead Corporation Drying system
US4574413A (en) * 1983-08-08 1986-03-11 Otting International, Inc. Methods and apparatus for employing electrical conductivity for fixing dye to carpets

Also Published As

Publication number Publication date
SE389059B (sv) 1976-10-25
DE2417441A1 (de) 1974-11-07
JPS508152A (da) 1975-01-28
DE2417441C2 (de) 1982-07-22
CH568798A5 (da) 1975-11-14
CA976618A (en) 1975-10-21
JPS5423456B2 (da) 1979-08-14
DK146349B (da) 1983-09-12
IT1009470B (it) 1976-12-10
GB1443265A (en) 1976-07-21
FR2226630B1 (da) 1977-10-14
DK146349C (da) 1984-04-24
FR2226630A1 (da) 1974-11-15

Similar Documents

Publication Publication Date Title
EP0014552B1 (en) Method of and apparatus for the corona discharge treatment of webs
FI88762B (fi) Lufttransport-arrangemang
US3859494A (en) Device for drying wet coatings applied to substrates of low electrical conductivity
US4534918A (en) Method and apparatus for the electrostatic pinning of polymeric webs
GB634702A (en) Screens for cathode-ray tubes
US3303401A (en) Method and apparatus for imparting an electrostatic charge to a layer of insulating material
US6504700B1 (en) Active discharge collector for minimizing positive and/or negative charges on moving material webs
US3404462A (en) Dielectric heat apparatus
US2923964A (en) Treatment of surfaces of polyethylene resins
US5152838A (en) Coating fluid drying apparatus
US2327695A (en) Static eliminator in printing
US3460475A (en) Apparatus for returning ink mist back to its source
US3636637A (en) Method and apparatus for drying liquid deposited on liquid receptive material
SU1487827A3 (ru) Электростатический высоковольтный электрод :
US1208238A (en) Apparatus for neutralizing static charges.
US3681558A (en) Capacitive high-frequency heating apparatus
US3278798A (en) Magnetohydrodynamic generators
JPS59111902A (ja) オゾン発生装置
SU383630A1 (ru) Вал для электростатического переноса краски
US2528428A (en) Electrostatic heating apparatus
NO149472B (no) Fremgangsmaate ved fremstilling av p-aminofenol
ITCR20090030A1 (it) Dispositivo di supporto per elettrodi di macchine per trattamento corona
EP0203233A2 (en) Method and apparatus for the electrostatic pinning of polymeric webs
US3831060A (en) Corona discharge device
KR102295258B1 (ko) 대기압 플라즈마용 멀티형 전극 장치