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WO2004078361A1 - Composants antiadherents pour dispositif d'application de matiere - Google Patents

Composants antiadherents pour dispositif d'application de matiere Download PDF

Info

Publication number
WO2004078361A1
WO2004078361A1 PCT/US2004/006362 US2004006362W WO2004078361A1 WO 2004078361 A1 WO2004078361 A1 WO 2004078361A1 US 2004006362 W US2004006362 W US 2004006362W WO 2004078361 A1 WO2004078361 A1 WO 2004078361A1
Authority
WO
WIPO (PCT)
Prior art keywords
exposed
low adhesion
gun
valve
components
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.)
Ceased
Application number
PCT/US2004/006362
Other languages
English (en)
Inventor
David L. Mancini
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.)
Nordson Corp
Original Assignee
Nordson 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
Application filed by Nordson Corp filed Critical Nordson Corp
Publication of WO2004078361A1 publication Critical patent/WO2004078361A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • 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
    • B05C5/00—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work
    • B05C5/02—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work the liquid or other fluent material being discharged through an outlet orifice by pressure, e.g. from an outlet device in contact or almost in contact, with the work
    • B05C5/0225—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work the liquid or other fluent material being discharged through an outlet orifice by pressure, e.g. from an outlet device in contact or almost in contact, with the work characterised by flow controlling means, e.g. valves, located proximate the outlet
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B1/00—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means
    • B05B1/30—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to control volume of flow, e.g. with adjustable passages
    • B05B1/3013—Lift valves
    • B05B1/302—Lift valves with a ball shaped valve member
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B7/00—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
    • B05B7/02—Spray pistols; Apparatus for discharge
    • B05B7/12—Spray pistols; Apparatus for discharge designed to control volume of flow, e.g. with adjustable passages

Definitions

  • the invention relates generally to apparatus and methods for applying material onto a surface. More particularly, the invention relates to preventing such material from adhering to parts exposed to the applied material.
  • a typical gun includes a valve mechanism and nozzle assembly, sometimes referred to in the industry as a packing cartridge.
  • the nozzle assembly has an orifice through which the material is ejected in a pattern.
  • the valve mechanism is also commonly used within the nozzle assembly, with the valve mechanism being open and closed in response to a control signal from an operator or controller.
  • the control signal may be a mechanical function such as from a manual trigger on the application device, or may be an electrical or pneumatic signal from a controller.
  • the valve mechanism typically includes a valve element such as a ball or needle, and a valve stem that seats and unseats the valve element against a valve seat to close and open the valve to control flow of the material through the nozzle.
  • a spring is also commonly used to assure the valve is closed when there is no control signal present to apply material to an article.
  • guns and nozzles There are many different types of guns and nozzles and the present invention is not limited to any particular type or configuration or application technology, including but not limited to spraying, dispensing, electrostatic, non-electrostatic, air assisted, manual, automatic, and so on.
  • the invention contemplates in one aspect applying a non-stick or very low adhesion material to various wetted or material exposed parts of a material application device, especially wetted parts that move or rub against another surface or areas that are difficult to clean or flush.
  • Such parts may include, but are not limited to, valve elements such as a spring and stem that are exposed to the material being applied through the device.
  • valve elements such as a spring and stem that are exposed to the material being applied through the device.
  • such parts are coated with polytetrafluoroethelene or PTFE so that the material flowing through the valve will not stick to the wetted parts.
  • liquid should not be construed as limited to liquid but rather more broadly to refer to any part that is exposed to the material flowing through the material application device, and thus may include liquid, solid, powder, slurries, suspensions, food products and so on.
  • Fig. 1 is a material application device that incorporates the present invention, illustrated in longitudinal cross-section;
  • Fig. 2 is a bias spring used in a control valve with the device of Fig. 1; and Fig. 3 is a valve stem used in a control valve with the device of Fig. 1.
  • the present invention contemplates reducing or eliminating the accumulation or adhesion of material on wetted or "material exposed" components of a material application device, particularly components that have to slide, move or rub against another surface or where material cannot easily be flushed, as in the case of the area or volume between various components.
  • a liquid spraying device such as a paint spray gun
  • Such systems include but are not limited to electrostatic and non-electrostatic systems, air assisted atomization and pressure atomization systems, and material application systems that are manually operated or automatic.
  • a material application device 10 in accordance with an exemplary embodiment of the invention is illustrated.
  • the device 10 in this example is a liquid spray gun such as model A7A available from Nordson Corporation, Westlake, Ohio, and the operation of which is described in the '107 patent and otherwise well known in the art.
  • any material application device may be used and need not be limited to liquid spray and dispensing guns.
  • the application device 10 includes generally a nozzle assembly 12 mounted on a gun body 14. Within the gun body 14 is a valve assembly 15 that includes a ball valve element 16 which selectively engages with a valve seat 18 to open and close the valve to control flow of material out the nozzle assembly 12. A ball tip 20 retains the ball and is attached to an adapter
  • the adapter 22 is attached to a forward end of a stem 24 so that translational movement of the stem 24 causes the ball to seat and unseat from the valve seat to control flow of material through the nozzle assembly 12.
  • a rearward end of the stem 24 is attached to a piston arrangement 26.
  • the piston arrangement 26 moves under the influence of air pressure applied to a port 28 from a pressurized air source (not shown in Fig. 1).
  • a bias spring 30 is captured between the adapter 22 and a cartridge element 32. The spring 30 biases the valve 15 closed when air pressure is absent or less than a value needed to overcome the bias force of the spring
  • the cartridge 32 may include lip seals 34 that engage the stem 24 and prevent material from passing back through the gun body 14 along the stem outer surface.
  • the spring 30 and portions of the stem 24 are directly exposed to the material flow, h particular, areas of the stem that rub against the spring are exposed to material, and a portion of the stem that slides against the lip seals 34 can also me exposed to the material. If the material adheres to these areas, friction may increase significantly and further the parts may stick in a position.
  • the wetted components that are exposed to the material being dispensed from the device 10 are coated with a non-stick or low stick or low adhesion material. Which components are coated is a matter of design selection and the particular application device 10 being used.
  • wetted parts will be coated either entirely or at least those moveable wetted parts that have portions that are exposed to the material.
  • surfaces that slide, rub or otherwise contact other surfaces in the application device are excellent candidates for such low adhesion coating material to reduce sticking and friction between the sliding parts.
  • material can accumulate between the spring 30 and a portion of the stem 24 and a portion of the adapter 22. This material can impeded movement of the stem and spring. Therefore, in accordance with the invention the spring inner surface, or the entire spring, is coated with the non-stick material.
  • the stem 24 portions that slide relative to the spring and against the lip seals 34 for example may also be coated with the non-stick material.
  • the entire stem need not be coated, for example, the portion of the stem that extends axially rearward of the lip seals since this portion of the stem is not exposed to the material being dispensed from the device 10.
  • component surfaces that are exposed to the applied material may be coated even if those surfaces do not slide or rub against another surface, since use of the low adhesion material would minimize the build-up of material over time which can reduce the effectiveness of components such as the spring.
  • the coating also can make cleaning those components easier and can reduce accumulation of material that could have other deleterious effects.
  • the non-stick or low stick, low adhesion coating material is PTFE, which may be applied to the components of interest by any well known and coimnercially available method such as by spraying, dipping, brushing and so on followed by an appropriate bake out process well known to those skilled in the art.
  • PTFE may be used and is available from many suppliers, such as TeflonTM from Dupont.
  • the invention is not limited to the use of PTFE, and contemplates any other non-stick or low stick or low adhesion material that has a low adhesion characteristic to the material being dispensed by the device 10 of interest.
  • any fluorocarbon material or material having non-stick characteristics examples of which include fluorocarbon polymers such as PTFE and the like.
  • fluorocarbon polymers such as PTFE and the like.
  • abrasion resistant PTFE is suitable.
  • Fig. 2 illustrates the spring 30, which may be coated in its entirety with the non-stick material, or just its inside surface or other selected portions if so desired.
  • Fig. 3 illustrates the stem with various portions masked off against having the non-stick material applied thereto for portions that are not exposed to the material being applied by the device 10 or that do not slide or rub against another surface.

Landscapes

  • Nozzles (AREA)

Abstract

L'invention concerne un dispositif d'application de matière comprenant un ou plusieurs composant possédant des surfaces qui sont exposées à la matière en cours d'application. Les surfaces exposées sont revêtues d'une matière antiadhérente ou faiblement adhérentes pour la réduction de l'accumulation de la matière appliquée sur la surface exposée. Une matière faiblement adhérente pouvant être utilisée est le PTFE. Les surfaces exposées qui glissent ou frottent contre une autre surface, telles qu'un ressort de sollicitation de soupape de commande (390) ou de tige de soupape (24), peuvent être revêtues.
PCT/US2004/006362 2003-03-04 2004-03-02 Composants antiadherents pour dispositif d'application de matiere Ceased WO2004078361A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US45188703P 2003-03-04 2003-03-04
US60/451,887 2003-03-04

Publications (1)

Publication Number Publication Date
WO2004078361A1 true WO2004078361A1 (fr) 2004-09-16

Family

ID=32962654

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2004/006362 Ceased WO2004078361A1 (fr) 2003-03-04 2004-03-02 Composants antiadherents pour dispositif d'application de matiere

Country Status (1)

Country Link
WO (1) WO2004078361A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015192896A1 (fr) * 2014-06-18 2015-12-23 Vermes Microdispensing GmbH Soupape de dosage pourvue d'un poussoir de soupape

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3201048A (en) * 1963-04-19 1965-08-17 Gen Motors Corp Multiple fluid spray gun with remotely operable selective valve control
US3702107A (en) 1971-01-19 1972-11-07 Nordson Corp An apparatus for striping inside seams of cans
US3837575A (en) * 1973-08-27 1974-09-24 Upjohn Co Spray gun
DE2532718A1 (de) * 1974-09-26 1976-04-15 Mert & Dougherty Inc De Vorrichtung zum verspruehen von fluessigkeiten als aerosole
FR2473672A2 (fr) * 1979-01-22 1981-07-17 Tech Nles Ste Gle Vanne pour fluide polluant ou dangereux
DE3606018C1 (en) * 1986-02-25 1987-06-11 Ehrensperger C Ag Injection gun (spray gun) for injecting (spraying) liquid or plastic materials
US4876982A (en) * 1987-06-30 1989-10-31 Claassen Henning J Apparatus for the application of liquid adhesives to a substrate
US5996968A (en) * 1994-05-28 1999-12-07 Danfoss A/S Valve driver element including a high temperature thermoplast for reducing friction
DE19854634C1 (de) * 1998-11-26 2000-02-24 Wolfgang Puffe Auftragskopf mit Rotationssieb
US20020190453A1 (en) * 2001-06-15 2002-12-19 Colder Products Company Coated spring and method of making the same

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3201048A (en) * 1963-04-19 1965-08-17 Gen Motors Corp Multiple fluid spray gun with remotely operable selective valve control
US3702107A (en) 1971-01-19 1972-11-07 Nordson Corp An apparatus for striping inside seams of cans
US3837575A (en) * 1973-08-27 1974-09-24 Upjohn Co Spray gun
DE2532718A1 (de) * 1974-09-26 1976-04-15 Mert & Dougherty Inc De Vorrichtung zum verspruehen von fluessigkeiten als aerosole
FR2473672A2 (fr) * 1979-01-22 1981-07-17 Tech Nles Ste Gle Vanne pour fluide polluant ou dangereux
DE3606018C1 (en) * 1986-02-25 1987-06-11 Ehrensperger C Ag Injection gun (spray gun) for injecting (spraying) liquid or plastic materials
US4876982A (en) * 1987-06-30 1989-10-31 Claassen Henning J Apparatus for the application of liquid adhesives to a substrate
US5996968A (en) * 1994-05-28 1999-12-07 Danfoss A/S Valve driver element including a high temperature thermoplast for reducing friction
DE19854634C1 (de) * 1998-11-26 2000-02-24 Wolfgang Puffe Auftragskopf mit Rotationssieb
US20020190453A1 (en) * 2001-06-15 2002-12-19 Colder Products Company Coated spring and method of making the same

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015192896A1 (fr) * 2014-06-18 2015-12-23 Vermes Microdispensing GmbH Soupape de dosage pourvue d'un poussoir de soupape

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