US3327685A - Apparatus for applying small particles to articles in an electric field - Google Patents

Apparatus for applying small particles to articles in an electric field Download PDF

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Publication number
US3327685A
US3327685A US362127A US36212764A US3327685A US 3327685 A US3327685 A US 3327685A US 362127 A US362127 A US 362127A US 36212764 A US36212764 A US 36212764A US 3327685 A US3327685 A US 3327685A
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US
United States
Prior art keywords
web
conveyor band
collection zone
disposed
high voltage
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
US362127A
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English (en)
Inventor
Heyl Gerhard
Luttgens Gunter
Schmitz Anton
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.)
Bayer AG
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Bayer AG
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Filing date
Publication date
Application filed by Bayer AG filed Critical Bayer AG
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Publication of US3327685A publication Critical patent/US3327685A/en
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Classifications

    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H11/00—Non-woven pile fabrics
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C19/00—Apparatus specially adapted for applying particulate materials to surfaces
    • B05C19/001—Flocking
    • B05C19/002—Electrostatic flocking

Definitions

  • the present invention relates to an apparatus for apply ing small particles, e.g. floccules, to a moving surface coated with an adhesive, which apparatus consists of a conveyor band with a charging device and an electric flocculating field.
  • small particles e.g. floccules
  • German patent specification 900,447 discloses an apparatus in which the conveyor band for the floccules is earthed a'nd'the article to which the floccules are to be applied, in this case a web of fabric, is contacted with a high voltage electrode on the surface which is not to be covered with floccules.
  • a disadvantage of this apparatus is that the application of floccules depends on the electric resistance of the material to which the floccules are to be applied. If the material has a good conductivity, it will be under high voltage over its whole length, in other words from the feed drum through the point where adhesive is applied and through the drying over right up to the point where the web is rolled up, including all rollers making contact with the band.
  • the high voltages required for the flocculating process are of the order of 100,000 volts, an apparatus of this kind is technically not feasible. If, on the other hand, the material to be flocculated has poor conductivity, it can be moved over earthed parts of the plant, but electric breakthrough then occurs in the material to the earthed layer of adhesive which is in any case more highly conductive. This disturbs the flocculating process, and plants operating by this process are therefore also not widely used in practice.
  • the above mentioned disadvantages are overcome in the apparatus according to the invention by forming the electric flocculating field between the conveyor band and the adhesive layer of the surface to be treated.
  • the conveyor band travels over two conductive and earthed rollers spaced apart and over at least one conductive roller situated between the first two rollers and connected to a source of high voltage.
  • the adhesive layer of the moving surface to be treated is connected to the earthed terminal of the high voltage source through an earthed coating device.
  • the fioccules are applied to the conveyor band in a field-free space by a dosing apparatus.
  • the conveyor band carries the floccules into the flocculating field which is adjustable and slowly increases in intensity.
  • the mov- "ice ing conveyor band constitutes the high voltage electrode of the localized electric field and it defines the boundaries of the field. This makes it necessary for the conveyor band to have a suitable electric resistance.
  • the textile web 1 to be flocculated is taken from the feed drum 2 and carried under the guide roller 3 to the point where the adhesive is applied, in this case a doctor knife 4.
  • the coated web is then deflected over the roller 5 so that in the flocculating field 21 between the deflecting rollers 12 and 13, the adhesive layer is on the undersurface of the web
  • the web is then pulled through a drying channel 22 by means of a winding device (not shown).
  • the floccules 6 to be applied are contained in a storage container 7 and drop through the bottom of this container on to a brush 8 which is set in rotation by a drive (not shown).
  • the brush 8 then applies the floccules to the endless conveyor band 19 through a screen 9 having a mesh corresponding to the length of the floccules, and the conveyor band 19 carries them into the flocculating field 21.
  • Both the container 7 and the screen 9 are made of metal and are at ground potential.
  • the electric flocculating field is formed on the one hand by the semi-conductive conveyor band 19, which is contacted with the high voltage source 20 through the insulated metal rollers 10 and 11,. and on the other hand by the web 1 to be flocculated, w-hose coductive layer of adhesive is con nected to the earthed terminal of the high voltage source 20 through the earth doctor knife 4.
  • the flocculating process is thus independent of the electric conductivity of the material to be treated.
  • the metal rollers 12, 13, 14, 15, 16 and 17 are earthed.
  • the roller- 15 is set in rotation by a drive (not shown) and it drives the conveyor band 19 in the direction of the arrow from the station where the floccules are supplied to the flocculating field 21.
  • the semi-conductive conveyor band 19 whose resistance between the rollers 10 and 14 on the one hand and the rollers 11 and 17 on the other hand is about 10 to 10 ohms, preferably about 10 ohms, an electric potential gradient is produced from the high voltage contact points on the rollers 10 and 11 'both to the earth contact point on the roller 14 and to the earth contact point on the roller 17.
  • the band 19 has a uniform high voltage potential.
  • a homogeneous flocculating field 21 is therefore formed in the region of the rollers 10 and 11 between the conveyor band 19 and the web 1 which is earthed through the adhesive.
  • the voltage drop on the band 19 between the high voltage roller 10 and the earthed roller 14 leads to a corresponding reduction in the field strength in the region of the rollers 10 and 14.
  • the conveyor band 19 is suitably a woven band coated on both surfaces with pigmented polyurethane.
  • the flocculating operation proceeds as follows on the apparatus described above.
  • the conveyor band 19 is at ground potential between the metal rollers 14 and 15, Le. below the device for dosing the floccules.
  • the floccules 6 are thus applied to the conveyor band solely by gravity in a field-free space.
  • the conveyor band carries the applied floccules over the roller 14 into the electric field which exists between the conveyor band and the material coated with adhesive and which increases in intensity towards the roller 10.
  • the electric field strength is adjusted so that in the direction of travel as far as the roller 10, all the fioccule particles becomes so highly charged by electrostatic induction and by contact with the path carrying a high voltage that they shoot towards the web.
  • the web 1 and the conveyor band 19 move in opposite directions.
  • the conveyor band 19 may be advantageous to arrange for the conveyor band 19 to move in the same sense as the material to be treated with floocules. Excess floccules are removed from the field of decreasing intensity from the roller 11 to the roller 17 by the conveyor band 19 and removed by suction through a gap 18 from the band 19 which is again at ground potential after it has passed the roller 17.
  • the speed of the conveyor band 19 is adjusted to the speed of the brush 8 so that the fioccules 6 lie side by side on the conveyor band with as little contact with each other as possible. If the floccules are too densely packed, they may fail to be removed singly in the electric field but be applied in clumps to the web to be treated.
  • the density of the floocules can be regulated by the speed of the Web 1. It is also possible to influence the density of the fioccules on the material to be treated by the varying quantity of floccules applied to the conveyor band 19 in unit time. This may be done, for example, by increasing the speed of the brush 8 or by using a wider meshed screen 9. The speed of the band 19 should then also be increased, as explained above.
  • An apparatus for applying flocculated material to a moving Web surface coated with an electrically conductive adhesive which comprises a high voltage electrical source, an electrically conductive member connected to a first output terminal of said source and disposed for contact with the adhesive coating on the web to establish said coating at a generally uniform electric potential corresponding to that of said first terminal and at a high voltage difference with respect to the electric potential of a second output terminal of said source, guide means disposed for engagement with said Web to direct the movement thereof lengthwise along a predetermined path passing through a fiocculated material collection zone, a conveyor band of limited electrical conductivity disposed for lengthwise movement along a path extending through said collection zone in spaced-apart relation to web sections passing therethrough and facing the adhesive coating on such web sections, means operable to deposit flooculated material upon said conveyor band for transport thereby into said collection zone, a first pair of electrically con ductive members each connected to said second output terminal and disposed for contact with said conveyor band at separated positions along the movement path thereof within said collection zone to establish therein a generally

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Electrostatic Spraying Apparatus (AREA)
US362127A 1963-04-24 1964-04-23 Apparatus for applying small particles to articles in an electric field Expired - Lifetime US3327685A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEF39565A DE1282521B (de) 1963-04-24 1963-04-24 Vorrichtung zum Auftragen von kleinen Teilchen, z. B. Flocken, im elektrischen Feld

Publications (1)

Publication Number Publication Date
US3327685A true US3327685A (en) 1967-06-27

Family

ID=7097830

Family Applications (1)

Application Number Title Priority Date Filing Date
US362127A Expired - Lifetime US3327685A (en) 1963-04-24 1964-04-23 Apparatus for applying small particles to articles in an electric field

Country Status (5)

Country Link
US (1) US3327685A (zh)
BE (1) BE646955A (zh)
DE (1) DE1282521B (zh)
GB (1) GB1022277A (zh)
NL (1) NL6404358A (zh)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3513011A (en) * 1966-04-22 1970-05-19 Ransburg Electro Coating Corp Electrostatic coating method
US3798048A (en) * 1971-07-27 1974-03-19 Nyvel Corp Method and apparatus for electrostatically coating an object

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3423462A1 (de) * 1984-06-26 1986-01-02 Uniroyal Englebert Textilcord S.A., Steinfort Verfahren und vorrichtung zum elektrostatischen beflocken eines faden- oder garnfoermigen materials

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2087260A (en) * 1935-04-18 1937-07-20 Research Corp Homogeneous piled surface
US2187624A (en) * 1932-10-10 1940-01-16 Carborundum Co Apparatus for the manufacture of coated webs
US2194253A (en) * 1932-10-27 1940-03-19 Carborundum Co Coating apparatus
US2223476A (en) * 1936-11-02 1940-12-03 John O Amstuz Method for making pile fabric
US2328577A (en) * 1940-01-12 1943-09-07 Behr Manning Corp Process and apparatus for grading and for coating with comminuted material
US2376922A (en) * 1941-06-04 1945-05-29 Behr Manning Corp Method of and apparatus for making pile fabrics
US2681446A (en) * 1950-11-07 1954-06-15 Lily Jane Blackmore Process and apparatus for making pile-surfaced material
US2784695A (en) * 1954-10-27 1957-03-12 Michigan Abrasive Company Apparatus for making abrasive coated sheet material

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE632106C (de) * 1935-05-28 1936-07-02 Carborundum Co Vorrichtung zum Herstellen von mit koernigem Stoff, vorzugsweise Schleifmittel, ueberzogenen Streifen
DE881635C (de) * 1936-11-02 1953-07-02 Behr Manning Corp Verfahren und Vorrichtung zur Herstellung von pluesch- bzw. samtartigen Stoffen
DE900447C (de) * 1937-05-24 1953-12-28 Behr Manning Corp Verfahren zur Herstellung von plueschartigen Stoffen
FR1044266A (fr) * 1951-05-28 1953-11-16 Dunlop Rubber Co Tissu à poil
DE1729555C3 (de) * 1967-09-01 1974-11-07 Amf Inc., New York, N.Y. (V.St.A.) Einrichtung zum Aufbringen eines Rohlaufstreifens auf eine im wesentlichen Reifengestalt aufweisende Karkasse

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2187624A (en) * 1932-10-10 1940-01-16 Carborundum Co Apparatus for the manufacture of coated webs
US2194253A (en) * 1932-10-27 1940-03-19 Carborundum Co Coating apparatus
US2087260A (en) * 1935-04-18 1937-07-20 Research Corp Homogeneous piled surface
US2223476A (en) * 1936-11-02 1940-12-03 John O Amstuz Method for making pile fabric
US2328577A (en) * 1940-01-12 1943-09-07 Behr Manning Corp Process and apparatus for grading and for coating with comminuted material
US2376922A (en) * 1941-06-04 1945-05-29 Behr Manning Corp Method of and apparatus for making pile fabrics
US2681446A (en) * 1950-11-07 1954-06-15 Lily Jane Blackmore Process and apparatus for making pile-surfaced material
US2784695A (en) * 1954-10-27 1957-03-12 Michigan Abrasive Company Apparatus for making abrasive coated sheet material

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3513011A (en) * 1966-04-22 1970-05-19 Ransburg Electro Coating Corp Electrostatic coating method
US3798048A (en) * 1971-07-27 1974-03-19 Nyvel Corp Method and apparatus for electrostatically coating an object

Also Published As

Publication number Publication date
GB1022277A (en) 1966-03-09
BE646955A (zh) 1964-08-17
NL6404358A (zh) 1964-10-26
DE1282521B (de) 1968-11-07

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