US3881447A - Electrostatic application of thermoplastic adhesive - Google Patents

Electrostatic application of thermoplastic adhesive Download PDF

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Publication number
US3881447A
US3881447A US392034A US39203473A US3881447A US 3881447 A US3881447 A US 3881447A US 392034 A US392034 A US 392034A US 39203473 A US39203473 A US 39203473A US 3881447 A US3881447 A US 3881447A
Authority
US
United States
Prior art keywords
wheel
powder
melt adhesive
electrode
rotatable member
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
US392034A
Other languages
English (en)
Inventor
Hans W Rebentisch
Gerhard W Steinmeyer
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.)
Bostik Inc
Original Assignee
USM Corp
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
Priority to DE2253444A priority Critical patent/DE2253444A1/de
Application filed by USM Corp filed Critical USM Corp
Priority to US392034A priority patent/US3881447A/en
Priority to CH1517673A priority patent/CH558213A/xx
Priority to FR7338623A priority patent/FR2225931A5/fr
Priority to GB5042873A priority patent/GB1450114A/en
Priority to NL7314911A priority patent/NL7314911A/xx
Priority to US05/541,652 priority patent/US3979529A/en
Application granted granted Critical
Publication of US3881447A publication Critical patent/US3881447A/en
Assigned to EMHART INDUSTRIES, INC. reassignment EMHART INDUSTRIES, INC. MERGER (SEE DOCUMENT FOR DETAILS). Assignors: EMHART ENTERPRISES CORP., A NJ CORP.
Assigned to EMHART ENTERPRISES CORP. reassignment EMHART ENTERPRISES CORP. CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). EFFECTIVE DATE: MAY 8, 1987 Assignors: USM CORPORATION
Assigned to BOSTIK INC., A CORP. OF DE reassignment BOSTIK INC., A CORP. OF DE ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: EMHART INDUSTRIES, INC.
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G15/00—Apparatus for electrographic processes using a charge pattern
    • G03G15/06—Apparatus for electrographic processes using a charge pattern for developing
    • G03G15/08—Apparatus for electrographic processes using a charge pattern for developing using a solid developer, e.g. powder developer
    • G03G15/0806—Apparatus for electrographic processes using a charge pattern for developing using a solid developer, e.g. powder developer on a donor element, e.g. belt, roller
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B5/00—Electrostatic spraying apparatus; Spraying apparatus with means for charging the spray electrically; Apparatus for spraying liquids or other fluent materials by other electric means
    • B05B5/025—Discharge apparatus, e.g. electrostatic spray guns
    • B05B5/057—Arrangements for discharging liquids or other fluent material without using a gun or nozzle
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B5/00—Electrostatic spraying apparatus; Spraying apparatus with means for charging the spray electrically; Apparatus for spraying liquids or other fluent materials by other electric means
    • B05B5/08—Plant for applying liquids or other fluent materials to objects
    • B05B5/14—Plant for applying liquids or other fluent materials to objects specially adapted for coating continuously moving elongated bodies, e.g. wires, strips, pipes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D1/00—Processes for applying liquids or other fluent materials
    • B05D1/007—Processes for applying liquids or other fluent materials using an electrostatic field
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D5/00—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures
    • B05D5/10—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures to obtain an adhesive surface
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D2401/00—Form of the coating product, e.g. solution, water dispersion, powders or the like
    • B05D2401/30—Form of the coating product, e.g. solution, water dispersion, powders or the like the coating being applied in other forms than involving eliminable solvent, diluent or dispersant
    • B05D2401/32—Form of the coating product, e.g. solution, water dispersion, powders or the like the coating being applied in other forms than involving eliminable solvent, diluent or dispersant applied as powders

Definitions

  • ABSTRACT Apparatus for applying a well-defined strip [21] Appl' 392034 of thermoplastic adhesive in powder form to a substrate. Powdered adhesive material is received from a [30] Foreign Application Priority Data hopper supply into compartments arranged around the on. 31, 1972 Germany 2253444 Periphery of a rotatable transporter Wheel The wheel by rotation, carries the adhesive to a delivery station 52 us. 01. 118/638; 118/621; 118/636 Where, Owing to the Presence of a Strong electrostatic 51 Int.
  • the invention concerns a device for the metered application of a melt-cement in powder-form, in a strip, onto a backing that is to be made to adhere at some later time.
  • the melt-cement is fed to a rotated wheel with defined zones for the reception of the cement, the wheel running through a hightension field existing between two applier-electrodes, such that the backing is passed between the applierelectrodes and in confrontation with the wheel and the hot-melt cement is precipitated onto the backing under the force exerted by the hightension field.
  • the invention has the basic aim of achieving increased thicknesses in the application of the powder-form melt-adhesive. This is attained by the expedient that the one applier-electrode is contained as a rod electrode in the wheel which transports the powder in recesses which have means of limiting the height of filling.
  • the rod electrode ensures that, from the point of delivery of the powder to the wheel, until the point of application on the backing, a strong high-tension field can operate upon the powder being transported on the wheel, whereby one can, entirely as one wishes, adjust the required strength of the hightension field by employing a correspondingly high voltage.
  • the coaxial rod electrode fits directly into the wheel, so that any special electrode arrangements inside the wheel at the applying station are rendered superfluous.
  • the powder When the powder comes into the zone of the applyingelectrode, opposite the wheel at the point where the desired transfer of the powder onto the backing takes place, the powder here undergoes a reversal of polarization, which extracts the powder out of the recesses in the wheel and allows it to drift in the direction of the backing.
  • the filling in the recesses (which can consist of chambers provided on the periphery of the wheel) there is provided a casing that rotates with the wheel and closes-off the chambers, such that practically no melt-adhesive can fall out of the chambers from the effect of gravity.
  • the casing is advantageously designed as an endless belt, enclosing the periphery of the wheel and traveling with it.
  • the recesses are also possible to construct the recesses as a ringgroove, facing upwards, in the edge of a rotatable plate.
  • a belt rotating with the wheel is not required since in this instance a spontaneous falling-out of melt-adhesive from the groove is not possible.
  • meltadhesive is to a certain extent sucked out of a section of a ring-groove, this gives rise to a more or less broad strip of powder-form melt-adhesive on the backing, according to the diameter of the ring-groove. Also, the smaller the diameter of the plate, the greater tendency there is for the melt-adhesive to be applied along a relatively broad strip.
  • the device described above permits the application of particularly narrow strips, the breadth of which depends essentially only upon the corresponding width of the chambers in the rotatable wheel.
  • FIG. I shows a device according to the invention with a wheel that is provided with chambers on its periph- FIG. 2 depicts the same device as in FIG. 1 taken in section along the line IIII of FIG. 1;
  • FIG. 3 shows a device according to the invention with a wheel constructed as a plate
  • FIG. 4 shows a backing coated with the powder-form melt-adhesive along a strip.
  • the device represented in FIG. 1 has a casing 1 in which is rotatably mounted a wheel 2 serving as a trans porter.
  • the wheel 2 rotates in the direction of the arrow, and its periphery, is provided with the chambers 3 which are filled with the powder-form melt-adhesive (represented by the dots).
  • the filling of the chambers 3 with the melt-adhesive takes place by means of a feed-pipe 4 which protrudes downward out of a reser voir 5 filled with the powder-form melt-adhesive.
  • the feed-pipe 4 has an orifice 6 which is so situated that it is practically closed off by the surrounding construction elements, an element about which more detail will be given below.
  • This belt is wound round the wheel 2 in such a way that practically no melt-adhesive can fall out of the chambers 3 from the effect of gravity.
  • the belt 7 is guided around four guide-rollers 8, 9, l0, and 11.
  • the only opening that still remains for the chambers 3 is in the upward direction, in which the powder-form melt-adhesive is then to be carried off in accordance with the further description.
  • the latter are constructed like toothed wheels, so that any melt-adhesive deposited on the inner side of the belt 7 is continuously pushed off by the teeth of the guiderollers.
  • the guide-roller can be moved sideways as indicated by the double arrow, and hence serves as a tensioning-roller. Any melt-adhesive powder clinging to the inner side of the belt 7 in the direction of the guideroller 8 will fall off the belt 7 and arrive in a waste-pipe 12, out of which it trickles down and can be taken up to the reservoir again.
  • a cardboard strip 13, serving as backing for the meltadhesive is guided.
  • the strip 13 is moved forward through a slot 14 in the casing 1, whereby it passes through an electrical high-tension field which brings about the strip-shaped application of the meltadhesive.
  • Serving as a means for the production of the high-tension field are two applier-electrodes 15 and 16, of which the applier-electrode 15 is fitted coaxially in the wheel 2, while the applier-electrode 16, on the other side of the strip 13, confronts the latter as a surface-electrode.
  • the high-tension electrode 15 receives its voltage via the shaft 17 which is guided in a bearing 18 to which the supply line 19 is connected.
  • the supply-line 20 leads to the high-tension electrode 16.
  • the casing 1 consists of an insulating material so that no short-circuit can occur between the electrode 16 and the bearing 18.
  • the meltadhesive particles migrate out of the chambers 3, upwards against gravity, and impinge upon the strip 21, from below, as a strip 21 on the cardboard strip 13, where due to adhesion and as a consequence of their lightness, they remain attached.
  • the cardboard strip 13 and the wheel 2 are, moreover, moving at a synchronized speed, so that a strip of powder 21 with a specified quantity of powder is obtained, which finally extends along the whole of the cardboard strip 13 passed through the equipment.
  • the cardboard strip 13 is thereby prepared for subsequent cementing to any other object.
  • the plate 22 is used as a conveyor for the melt-adhesive powder, being secured onto the upper end of the vertically-guided shaft 23.
  • the shaft 23 is driven by gearwheel 24 in a manner which is not of interest for a full description of the present invention.
  • the ring-groove 25 is formed axially into the plate 22, and is filled with the powderform melt-adhesive (see dots). The melt-adhesive thus trickles out of the reservoir 26 and downward through the feed-pipe 27, then out of the latter into the ringgroove 25.
  • the stripper 28 is provided for levelling-off the meltadhesive in the ring-groove 25, this stripper extending outward from the middle of plate 22, essentially radially, and pressing lightly against the plate 22. With the rotation of plate 22, powder-material caught by the stripper 28 is stopped and, due to a slight obliquity of the positioning of stripper 28 relative to the radial direction, it is conveyed outward so that it can fall into the overflow-channel 29 and be taken up for re-use.
  • the high-tension field is here produced by means of two applier-electrodes 30 and 31, of which the applier-electrode 30 is designed as a surface-electrode above the plate 22 while the applier-electrode 31 forms a round disc underneath the plate 22.
  • the spatial limit of the high-tension field is therefore essentially determined by the upper applier-electrode 30, which can be constructed round or rectangular in the dimensions of the desired width of the application of adhesive.
  • the applier-electrode 30 receives its voltage via the supplyline 32, while the applier-electrode 31 receives its voltage via the supply-line 33, the metallic bearing 34 and the metallic shaft 23. Over this path there thus exists a direct metallic, and therefore electrically effective, contact. Under the effect of the high-tension field, melt-adhesive particles are then drawn upward out of the ring-groove 25 and precipitated upon the cardboard strip 13, from below, in the shape of a strip of powder 21.
  • the thickness of the powder-strip 21 is dependent upon the relation of the forward-feed speed of the cardboard strip 13 and the rate of rotation of the plate 22.
  • FIG. 4 is shown how a cardboard strip 13, onto which a powder-strip 21 has been applied, appears.
  • the powder-strip 21 extends uniformly in the lengthwise direction of the cardboard strip 13, and thereby, there is an application of powder of definite width and height.
  • the applierelectrodes are in each case at such a distance that, on the one hand, full effect is exerted on the adhesivepowder while, on the other hand, the cardboard strip 13 together with the respective conveyor can be passed between the applier-electrodes without hindrance.
  • the cardboard strip is not touched in the zone of the powder-strip that has been applied, and hence the powder-strip 21 can reliably adhere to the cardboard-strip 13 until the activation of the adhesive.
  • a device for the application of a powder melt adhesive in the form of a strip onto a backing material, which strip is to be subsequently used to adhere the backing comprising:
  • said means for containing said powder-melt adhesive comprises a plurality of chambers opening radially outwardly from said wheel and said quantity limiting means comprises means for covering and uncovering said chambers during rotation of said wheel to further thereby retain powder-melt adhesive in said chambers against the force of gravity.
  • a device as set forth in claim 4 wherein said means for covering and uncovering said chambers comprises an endless belt having a portion thereof in wrap-around frictional contact with the periphery of said wheel for movement responsive to rotation of said wheel.
  • said means for containing said powder-melt adhesive comprises a ring-groove formed in a circular surface of said wheel.
  • said quantity limiting means comprises means for limiting the height of powder-melt adhesive in said ring-groove in the form of a stripper member disposed adjacent said circular surface of said wheel and before said stationary electrode in relation to the rotation of said wheel.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Electrostatic Spraying Apparatus (AREA)
  • Adhesives Or Adhesive Processes (AREA)
  • Coating Apparatus (AREA)
US392034A 1972-10-31 1973-08-27 Electrostatic application of thermoplastic adhesive Expired - Lifetime US3881447A (en)

Priority Applications (7)

Application Number Priority Date Filing Date Title
DE2253444A DE2253444A1 (de) 1972-10-31 1972-10-31 Vorrichtung zum dosierten auftragen eines pulverfoermigen schmelzklebers auf einen traeger
US392034A US3881447A (en) 1972-10-31 1973-08-27 Electrostatic application of thermoplastic adhesive
CH1517673A CH558213A (de) 1972-10-31 1973-10-29 Auftragvorrichtung zum auftragen von pulverfoermigem material auf ein werkstueck.
GB5042873A GB1450114A (en) 1972-10-31 1973-10-30 Applicators for particulate material
FR7338623A FR2225931A5 (US06826419-20041130-M00005.png) 1972-10-31 1973-10-30
NL7314911A NL7314911A (US06826419-20041130-M00005.png) 1972-10-31 1973-10-30
US05/541,652 US3979529A (en) 1972-10-31 1975-01-16 Electrostatic application of thermoplastic adhesive

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2253444A DE2253444A1 (de) 1972-10-31 1972-10-31 Vorrichtung zum dosierten auftragen eines pulverfoermigen schmelzklebers auf einen traeger
US392034A US3881447A (en) 1972-10-31 1973-08-27 Electrostatic application of thermoplastic adhesive

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US05/541,652 Division US3979529A (en) 1972-10-31 1975-01-16 Electrostatic application of thermoplastic adhesive

Publications (1)

Publication Number Publication Date
US3881447A true US3881447A (en) 1975-05-06

Family

ID=25764036

Family Applications (1)

Application Number Title Priority Date Filing Date
US392034A Expired - Lifetime US3881447A (en) 1972-10-31 1973-08-27 Electrostatic application of thermoplastic adhesive

Country Status (6)

Country Link
US (1) US3881447A (US06826419-20041130-M00005.png)
CH (1) CH558213A (US06826419-20041130-M00005.png)
DE (1) DE2253444A1 (US06826419-20041130-M00005.png)
FR (1) FR2225931A5 (US06826419-20041130-M00005.png)
GB (1) GB1450114A (US06826419-20041130-M00005.png)
NL (1) NL7314911A (US06826419-20041130-M00005.png)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1179330A2 (en) * 2000-08-04 2002-02-13 Zuiko Corporation Method manufacturing disposable diaper
US20040016500A1 (en) * 2000-08-04 2004-01-29 Ikuo Tachibana Method for manufacturing disposable worn article
US20060206051A1 (en) * 2005-03-01 2006-09-14 Hamilton Dwight A Gas irrigator for surgical procedures
US20080086958A1 (en) * 2006-10-17 2008-04-17 Ewald Dorken Ag Dimpled sheet
US20080227350A1 (en) * 2005-07-25 2008-09-18 Ewald Dorken Ag Method For the Production of a Web
US20090041999A1 (en) * 2005-04-22 2009-02-12 Ewald Dorken Ag Constructional sealant material
US20090208687A1 (en) * 2006-08-18 2009-08-20 Ewald Dorken Ag Web and adhesive strip
US20090283207A1 (en) * 2000-04-08 2009-11-19 Zuiko Corporation Method for manufacturing disposable worn article

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL185986C (nl) * 1977-09-28 1990-09-03 Dynic Corp Werkwijze voor het bekleden van een bladmateriaal, zoals textielstof, en een inrichting daarvoor.

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2576047A (en) * 1948-10-21 1951-11-20 Battelle Development Corp Method and apparatus for printing electrically
US2691345A (en) * 1949-02-05 1954-10-12 Huebner Company Combustion precipitronic process and apparatus
US2820716A (en) * 1954-04-01 1958-01-21 Chicopee Mfg Corp Method of forming nonwoven fabric
US3678894A (en) * 1969-12-24 1972-07-25 Indev Inc Flocking

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2576047A (en) * 1948-10-21 1951-11-20 Battelle Development Corp Method and apparatus for printing electrically
US2691345A (en) * 1949-02-05 1954-10-12 Huebner Company Combustion precipitronic process and apparatus
US2820716A (en) * 1954-04-01 1958-01-21 Chicopee Mfg Corp Method of forming nonwoven fabric
US3678894A (en) * 1969-12-24 1972-07-25 Indev Inc Flocking

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20090283207A1 (en) * 2000-04-08 2009-11-19 Zuiko Corporation Method for manufacturing disposable worn article
EP1179330A2 (en) * 2000-08-04 2002-02-13 Zuiko Corporation Method manufacturing disposable diaper
US20040016500A1 (en) * 2000-08-04 2004-01-29 Ikuo Tachibana Method for manufacturing disposable worn article
EP1179330A3 (en) * 2000-08-04 2004-05-26 Zuiko Corporation Method manufacturing disposable diaper
US20060206051A1 (en) * 2005-03-01 2006-09-14 Hamilton Dwight A Gas irrigator for surgical procedures
US20090041999A1 (en) * 2005-04-22 2009-02-12 Ewald Dorken Ag Constructional sealant material
US20080227350A1 (en) * 2005-07-25 2008-09-18 Ewald Dorken Ag Method For the Production of a Web
US8808481B2 (en) * 2005-07-25 2014-08-19 Ewald Dorken Ag Method for the production of a web
US20090208687A1 (en) * 2006-08-18 2009-08-20 Ewald Dorken Ag Web and adhesive strip
US8535786B2 (en) 2006-08-18 2013-09-17 Ewald Dorken Ag Web and adhesive strip
US20080086958A1 (en) * 2006-10-17 2008-04-17 Ewald Dorken Ag Dimpled sheet

Also Published As

Publication number Publication date
FR2225931A5 (US06826419-20041130-M00005.png) 1974-11-08
DE2253444A1 (de) 1974-05-09
NL7314911A (US06826419-20041130-M00005.png) 1974-05-02
GB1450114A (en) 1976-09-22
CH558213A (de) 1975-01-31

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Legal Events

Date Code Title Description
AS Assignment

Owner name: EMHART INDUSTRIES, INC., A CONNECTICUT STOCK CORP.

Free format text: MERGER;ASSIGNOR:EMHART ENTERPRISES CORP., A NJ CORP.;REEL/FRAME:004870/0112

Effective date: 19871216

Owner name: EMHART ENTERPRISES CORP.

Free format text: CHANGE OF NAME;ASSIGNOR:USM CORPORATION;REEL/FRAME:004876/0901

Effective date: 19871104

Owner name: EMHART INDUSTRIES, INC.,CONNECTICUT

Free format text: MERGER;ASSIGNOR:EMHART ENTERPRISES CORP., A NJ CORP.;REEL/FRAME:004870/0112

Effective date: 19871216

AS Assignment

Owner name: BOSTIK INC., A CORP. OF DE, DELAWARE

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:EMHART INDUSTRIES, INC.;REEL/FRAME:005244/0716

Effective date: 19890924