CA1295356C - Poppet-valve-controlled fluid nozzle applicator - Google Patents
Poppet-valve-controlled fluid nozzle applicatorInfo
- Publication number
- CA1295356C CA1295356C CA000562976A CA562976A CA1295356C CA 1295356 C CA1295356 C CA 1295356C CA 000562976 A CA000562976 A CA 000562976A CA 562976 A CA562976 A CA 562976A CA 1295356 C CA1295356 C CA 1295356C
- Authority
- CA
- Canada
- Prior art keywords
- nozzle
- fluid
- valve
- aperture
- orifice
- 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
Links
Classifications
-
- 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
- B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
-
- 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
-
- 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
- B05B1/02—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to produce a jet, spray, or other discharge of particular shape or nature, e.g. in single drops, or having an outlet of particular shape
- B05B1/08—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to produce a jet, spray, or other discharge of particular shape or nature, e.g. in single drops, or having an outlet of particular shape of pulsating nature, e.g. delivering liquid in successive separate quantities ; Fluidic oscillators
- B05B1/083—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to produce a jet, spray, or other discharge of particular shape or nature, e.g. in single drops, or having an outlet of particular shape of pulsating nature, e.g. delivering liquid in successive separate quantities ; Fluidic oscillators the pulsating mechanism comprising movable parts
-
- 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
- B05B1/3093—Recirculation valves, i.e. the valve element opens a passage to the nozzle and simultaneously closes at least partially a return passage the feeding means
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B12/00—Arrangements for controlling delivery; Arrangements for controlling the spray area
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B15/00—Details of spraying plant or spraying apparatus not otherwise provided for; Accessories
- B05B15/14—Arrangements for preventing or controlling structural damage to spraying apparatus or its outlets, e.g. for breaking at desired places; Arrangements for handling or replacing damaged parts
- B05B15/18—Arrangements for preventing or controlling structural damage to spraying apparatus or its outlets, e.g. for breaking at desired places; Arrangements for handling or replacing damaged parts for improving resistance to wear, e.g. inserts or coatings; for indicating wear; for handling or replacing worn parts
-
- 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
- B05B7/04—Spray pistols; Apparatus for discharge with arrangements for mixing liquids or other fluent materials before discharge
- B05B7/0416—Spray pistols; Apparatus for discharge with arrangements for mixing liquids or other fluent materials before discharge with arrangements for mixing one gas and one liquid
- B05B7/0441—Spray pistols; Apparatus for discharge with arrangements for mixing liquids or other fluent materials before discharge with arrangements for mixing one gas and one liquid with one inner conduit of liquid surrounded by an external conduit of gas upstream the mixing chamber
- B05B7/0475—Spray pistols; Apparatus for discharge with arrangements for mixing liquids or other fluent materials before discharge with arrangements for mixing one gas and one liquid with one inner conduit of liquid surrounded by an external conduit of gas upstream the mixing chamber with means for deflecting the peripheral gas flow towards the central liquid flow
-
- 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
- B05B7/06—Spray pistols; Apparatus for discharge with at least one outlet orifice surrounding another approximately in the same plane
- B05B7/062—Spray pistols; Apparatus for discharge with at least one outlet orifice surrounding another approximately in the same plane with only one liquid outlet and at least one gas outlet
- B05B7/066—Spray pistols; Apparatus for discharge with at least one outlet orifice surrounding another approximately in the same plane with only one liquid outlet and at least one gas outlet with an inner liquid outlet surrounded by at least one annular gas outlet
-
- 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
Landscapes
- Nozzles (AREA)
- Coating Apparatus (AREA)
- Spray Control Apparatus (AREA)
- Spinning Methods And Devices For Manufacturing Artificial Fibers (AREA)
Abstract
ABSTRACT
A novel preferably poppet-valve-controlled fluid appli-cator for extruding hot melt and other coating fluids and the like as fibers or filaments and/or droplets upon moving webs and other surfaces wherein the valve seat tip blocks or per-mits the flow of the fluid into a hollow nozzle insert com-municating with, preferably, a needle-like nozzle tube spray extruder, with provision for adjustment to produce controlled fiber and/or droplet spray coatings, and preferably though optionally with air-shaping control of the coatings.
A novel preferably poppet-valve-controlled fluid appli-cator for extruding hot melt and other coating fluids and the like as fibers or filaments and/or droplets upon moving webs and other surfaces wherein the valve seat tip blocks or per-mits the flow of the fluid into a hollow nozzle insert com-municating with, preferably, a needle-like nozzle tube spray extruder, with provision for adjustment to produce controlled fiber and/or droplet spray coatings, and preferably though optionally with air-shaping control of the coatings.
Description
~Z~35356 P~PPET-VALVE-CONTROLLED
FLUID NOZZLE APPLICATOR
The present invention relates to fluid nozzle appl;-cator systems, being more particularly directed to such sys-tems controlled by mechanical or electromechanical valvin~
devices for enabling metered intermittent, patterned, or continuous coatings to be deposited in controlled thickness from the nozzles upon moving webs or other surfaces, as in the application of hot melt adhesives and other coating fluids such as those described, for example, in United States Patents Nos. 3,595~204, 4,020,194 and 4,476,165.
Prior valves for enabling such operation, particularly with longitudinal slot nozzles and the like, as described in said patents, have included two-way poppet valves with a single fluid supply inlet to the valve assembly (such as the type described in "Extruder Valve", a 1977 bulletin of Acu-met-er Laboratories, Inc., the assignee of the present inven-tion), and more recently three-way poppet valve structures enabling precise and constant thickness patterns oE f.luid coating with negligible after-drool and with a very short stroke that permits more rapid on/off cycLe times--such being described in my United States Patent No. 4,5hS,217.
a~;, ',i ~ : -'.`.'i ,..
~1 , ,1"
~2~5356 .
~ hile such and other valving structures are particu-larly suieed to the types of fluid extrusion or deposition nozzles above-referenced and similar extruders, there are occasions where it is desired to spray or even atomize or fiberize the fluid upon the moving web or other surface, which requires the use of finer nozzle orifices and even needle-like nozzles with fine dispensing openings. It is mo}e particularly to the adaption of poppet-valve structures and preferably said three-way poppet valves to such extruding spray-like or atomizing or fiberizing nozzles or heads that the present invention is principally (though not exclusively) directed, such nozzle dispensers having properties and characteristics often quite distinct from the before-men-tioned types of extrusion nozzles.
An object of the present invention, accordlngly, is to provlde a new and improved poppet-valve-controlled fluid nozzle applicator particularly useful, though not exclusi-vely, with such extruded sprav or atomizing type disoells~ng applicators and the like.
A further object is to provide such a novel applicator that operates with a preferred three-way poppet valve.
~ .............. , ; ~ '~, 129~3~
Still another object is to provide a novel applicator for the intermittent (and continuous) extrusion or spray of fluids through fine needle-like nozzles or dispensers; and further, where desired, to enable the shaping, varying or controlling of the fluid spray in a defined manner during the extrusion.
Other and further objects will be explained hereinafter and are more particularly delineated in the appended claims. In summary, therefore, the present invention may be considered as providing a poppet valve-controlled fluid nozzle applicator system having, in combination, a longitudinally extending, reciprocally mounted valve stem carrying a poppet valve constrained within a fluid supply chamber communicating with a pressurized and metered fluid supply source, the poppet valve having a downwardly converging surface terminating in a valve tip; a nozzle mounted to depend from a region of lowermost reciprocation of the valve tip, the nozz:Le having a first passage therein with an opening at an upper end thereof into which the valve tip may fit to block fluid flow from the chamber into the passage when the valve stem reciprocates to a lowermQst position, the valve tip engaging a portion of the nozzle surrounding the opening along a line-contact circle the diameter of which has a magnitude that is a minor portion of the magnitude of the diameter of the poppet valve, the nozzle having a second passage therein that is substantially narrower than the first sd/sp ~2~53~6 passage, the second passage having an upper end that communicates directly with the lower end of the first passage and having a lower end with a fine bottom orifice thro~lgh which fluid exits upon elevation of the valve tip from the region of lowermost reciprocation; a dispensing head disposed about the nozzle and having a bottom aperture in substantial alignment with the bottom orifice of the nozzle, the dispensing head having means for adjusting the position of the dispensing head relative to the nozzle within a range of positions from a position at which the bottom orifice of the nozzle is just above the bottom aperture of the dispensing head, through a position at which the orifice and the aperture are substantially flush with one another, to a position at which the orifice is below the aperture, the nozzle having a conical outer surface with an apex region adjacent to the bottom orifice and the dispensing head having a conical inner surface surrounding and spaced from the conical outer surface of the nozzle and having an apex region adjacent to the bottom aperture; and means for directing air conically convergingly inward in the space between the conical surfaces and thereafter upon fluid exiting from the orifice as the fluid is in free flight therefrom, and in which the nozzle has a cylindrical portion terminating the apex region thereof whereby the conically convergingly inward directed air is redirected along the direction of fluid exiting from sd/~
12g~3~6 the bottom orifice, the diameter of the aperture being greater than the diameter of the cylindrical portion so that the aperture remains open even when said cylindrical portion is within said aperture.
The invention will now be described with reference to the accompanying drawings, Fig. 1 of which is a longitudinal section of the apparatus of the invention in preferred form;
Fig. 2 is an isometric view thereof; and Figs. 3A, 3B and 3C are fragmentary longitudinal sections of different positions of adjustment of the nozzle portion of the apparatus of Figs. 1 and 2;
Fig. 5 is a view similar to Fig. 1 of a two-way poppet valve embodying features of the invention:
Figs. 4 and 6 are respectively system block diagrams showing how the valve-nozzles of Figs. 1 and 5 may be operated for the purposes herein; and sd/~, -4A-129~;3~
Figs. 7A and 7B illustrate metering pump mounting ad-jacent the respective three-way and two-way poppet valve nozzle applicator structures of Figs. 1 and 5 (Figs. 4 and 6).
Referring to the drawings, for illustrative purposes, as before stated, the inventlon is first described in connec-tion with a preferred three way poppet valve of the type dis-clo.sed in said Patent No. 4,565,217, having a housing or body 1 provided with longitudinally extending valve stem or piston 3 axially reciprocally mounted within communicable upper and lower (as shown) longitudinally displaced fluid chambers 5 and 5'. The lower chamber 5' transversely communicates with a fluid supply source at 7', such as a pressurized metered hot melt or other coating fluid or adhesive fluid supply, as described in said patents, for example, and the upper chamber 5, with a fluid return path 7. The valve piston or stem 3 carrie.s at its lower end, ln the orientat:Lon shown, a valve head 9 having upwardly and downwardly conical converging sec-tions 9' and 9" contained within the lower chamber 5'. The upper converging conical section 9', when the stem 3 is reci-procated to its upperntost position, bears agains~ the lower end region 11' of the valve seat opening 11 communcating the . ~ , , .
S~56 lower and upper chambers 5' and 5 to close off such communi-cation. The lower oppositely or downwardly converging coni-cal section 9 of the poppet valve head 9 terminates in a conical tip T that, when the valve stem reciprocates down-wardly to its lowest position or point, enters and blocks off the top of a narrow hollow insert or other recess 13 in the upper portion of a conically terminated extrusion sprav or dispensing nozzle 15. The lnsert or recess 13 communicates dlrectly with a hollow needle-llke thinner tube or stem N
(that may actually be a hyperdermic- like hollow needle or other tube including a tubular recess preformed in the nozzle cone) ln the lower portlon of the nozzle houslng 15 that, when the valve stem tlp T ls elevated to open fluid communi-cation from the lower chamber 5' into the nozzle hollow insert 13, exits fluld through the lower aperture(s) N' of the needle nozzle tube or stem.
Preferably, as shown ln Figs. 1 and 2, an atolllizer head coaxlally surrounds the conical nozzle houslng 15, but with a V-shaped somewhat conlcal space V provlded therebetween for enabling relatlve longltudinal adjustment of the position of the nozzle housing 15 and the aperture A' of the head A and for later-described conical air flow when desired. Such ad-~ustment, as by the threaded section 15', Fig. 2 (or other . , '~ . - ''' ' ' ~2~3~6 adjustable structure including slidable adjustment), ~
control the fluid exiting point of the needle, tube or stem opening(s) N' to recessed positions above the aperture A' of sonewhat larger diameter (Fig. 3A), or to substantial align-ment or a flush position therewith (Fig. 3B), or to extended positions beyond (Fig. 3C), thereby to varying the character of the fluid extrusion for adjustable effects. The recessed position of Fig. 3A has been found to cause the extruded spray to assume a mainly continuous filament or fiber charac-ter as air introduced at 20 and conically intersecting the extruded fluid in free flight outside and below the nozzle opening N', bonds or stretches the fluid into a continuous filament form; the flush position of Fig. 3B, producing a combination of fiber or filaments and droplets; and the extended position o~ Fig. 3C, producing a spray mainly of droplets. This adjustment thus has been found to permit con-trol of the nature of the extruded spray or depositlon and the ratio of fibers-to-droplets, for exampLe.
The valve stem 3 is mechanically reciprocated in the illustrative embodiment of Figs~ 1 and 2 by pneumatic pressurized-fluid means acting first downwardly upon the air ~!
i , :~' ~9~356 piston head 3' of the valve stem or piston 3 from air inlet (outlet) 2 in an air manifold body 4 at the top of the valve body 1, and upwardly on the head 3' from the inlet (outlet) 2'. The head 3' is shown provided with a seal 6 and a lower retaining plate 6' (bearing and seal) held on the upper end of the valve stem 3 by hexagonal nuts and washers 8, 8'.
Upper and lower retaining plates and piston seals are shown at 10, with 'O' rings about the flu~d supply and return pipes 7' and 7; and a further seal washer 12 at an upper flange of the extrusion nozzle 15.
Should further control be desired of the nature, shape and pattern and/or distribution of the fluid deposits (fila-ments or fibers, droplets, etc. or combinations or the same in various proportions) upon the moving web or other surface that may be disposed below the valve-nozzle-aperture head 1-15 (schematically designated by W in Figs. 1 and 2), the atomizer insert A may be coaxially circumscribed, totally or in sectors, by an outer houslng sleeve H. The sleeve H is provided with an air-flow or other fLuid flow passage H' external to the member A, supplied at 22, and that terminates in downwardly and centrally inwardly oriented exiting trim ear portions H' to direct further pressurized air or other ~., ..
~2~3~6 pressurized fluid) axially inwardly, on the fluid filament shown at the region P in Fig. l, well below the nozzle and insert openings N'-A'. The inwardly directed air cone provi-ded through the V channel in A, acting symmetrically below the nozzle openings N' and upon the free-flight extruded fluid spray, may be modified, including directionally deflec-ted, by the supplemental trim ear air at ~', and has been found remarkably to bond continuous very thin filaments or flbers (order of O.Olmm) and/or provide droplets or combina-tions of the same in a controlled and predictable manner to produce the desired coating distribution and dimensions upon the web W, and in either continuous or programmable inter-mittent fashion. Additional air supplied at 24 and from other ears, labelled "FAN EARS" in Fig. 4, not shown in Fig.
1 but in back of and in front the nozzle section 15, disposed 90 circumferentially displaced from H', for example, can further enable pattern deflection and containing.
For intermittent operation of the poppet or slmllar valve 1, it has been found possible even to obtain substan-tially the same fiber or filament uniform coating patterns of, for example, hot melt elastomeric rubber, acrylic or ethelyne vinyl acetate, etc., such as, for example, Findlay 3 29~3~i Company Type 990-3346, irrespective of intermittency fre-quency (with fluLd volume extrusion synchronized with ~eb speed and synchronized air flow volumes/velocity, where used) over wide ranges of such speeds ranging from about 15 to hi~h 180 meters/minute line speeds, more or less. A hollow needle stem applicator N about lO mm long and 0.35 mm ln diameter, communicating with a carbide wear-resistant insert 13 of about 0.75 mm insider diameter, is useful for this applica-tion, with fiber-to-droplet ad~ustments ranging from about 0.457 mm above A (Fig. 3A) to about 0.457 mm beyond A (Fig.
3C). Air-shaping by air flow volume ranging from about 12 to about 65 liters per minute, directed, for example, at P, approximately 6 mm below th4 point of release of the fluid, has been found to distribute continuous fibers of the order of 0.01 mm thick over patterns ranging from about 6 mm to 38 mm in width, more or less--and with sharp cut-on and cut-off edges, even at high line speeds, for intermittent operation.
The relatlvely remote position oE the fluid nozzle in my prior U.S. Patent No. 4,565,217 enabled separation by an intermediate fluicl discharge plate; but the additional capa-citance effect caused by the remote nozzle positioning was found in some instances to cause heavy droplets of coating flu$d when the valve is closed. At high reciprocation rates, "~
'~ '''1.~ i ~2~ 6 moreover, the "punching" action induces fluid column effects that drive additional fluld through the nozzle during the closlng action.
For avoiding such effects, the present invention on the other hand, in effect imbeds the fluid nozzle structure 15 into the poppet valve fluid supply chamber 5' and enables direct contact with the poppet valve stem 3, with the dimen-sions of the hollow insert 13 and the preferably narrower needle tube applicator N ad~usted such that the before-men-tloned addltional capacitance of my prior system is entirely obviated and no spurious fluid droplet deposits after valve closure result. The design thus provides for less fluid dis-placement during valve closure. In addition the valve stem reciprocating stroke of the present invention has been reduced (to the order of 0.020"--about one-third of that used in prior commercial forms of my before-described patented three-way poppet valve) which prevents any fluid column effect emanating from longer stroke inducement of addltional fluid displacement through the nozzle.
A preferred system for operatlng the poppet-valve-nozzle sy~tem of Figs. l and 2 is shown in Fig. 4, wlth the valve assembly 1 qhown supplied by hot melt supply line 7' from the positive displacement metering pump MP, driven by a '~ ~r .
! .~ '.
',~ ,/
~z~a~3~6 ~12-digital motor drive under the control of a speed control con-nected with a web-speed pick-up sensor, in conventional fashion, as so-labelled, for preferred synchronous meter fluLd volume and web line speed. The air supplied at A' via line ZO ("CONE") and at H' via line 22 (and, if used, from the before-mentioned "FAN EARS") is heated at H in view of the hot melt fluid useage, and its flow (volume/velocity) is also preferably synchronously (proportionally) controlled with fluid volume and web line speed at S.
While the three-way poppet valve herein-described with direct supply line 7' and return 7 to the hot melt source or tank is preferred, the novel nozzle-valve construction and also the novel air interaction structures, if used, may also be employed with two-way poppet valve constructions, though this is not considered as operationally desirable as the three-way valve. Thus, a two-way poppet valve construction is shown in Fig. 5, otherwise slmilar to the three-way poppet valve of Figs. 1 and 2, but with a closed upper fluid chamber 5" that is not returned by a return outlet 7 as in the system of Fig. 4. Instead, the two-way valve system is provided in the supply line 7', Fig. 6, with a pressure relief valve PR
designed to operate open for fluid passage when the two-way poppet valve is closed for intermittent ON/OFF operation, and . .
.~
.~ ,. . ~.
~L~9~;3~6 is connected back to the delivery reservoir or supply tank.
During closure of the two-way poppet valve, the PR vaLve will redirect the supply fluid to the reservoir tank. Under cer-tain conditions, the combination of such a two-way poppet valve, together with PR valve, will provide for reasonable satisfactory operation, effective up to the point when the PR
valve becomes operational, and therefore partially or totally directing all fluid through the PR valve and no fluid to the head 1, by-passing the head and supply chamber 5'.
For excellent uniform hot melt thin fiber-filament coatings, moreover, it has been found important to locate the poppet-valve fluid metering pump right at, or adjacent the poppet valve 1. The mounting of the metering pump to the valve assembly is therefore shown in Figs. 7A and 7B for the three-way and two-way poppet valve assemblies of Figs. 1 and 5 (Figs. 4 and 6), respectively.
Further modifications will occur to those skilled in this art, including the use of other types oE vaLving (though generally properly generically describable of "poppet"-type), and other types of fine spray nozzles or orifices, and such are considered to fall withln the spirit and scope of the invention as defined in the appended claims.
~1` ' ,'
FLUID NOZZLE APPLICATOR
The present invention relates to fluid nozzle appl;-cator systems, being more particularly directed to such sys-tems controlled by mechanical or electromechanical valvin~
devices for enabling metered intermittent, patterned, or continuous coatings to be deposited in controlled thickness from the nozzles upon moving webs or other surfaces, as in the application of hot melt adhesives and other coating fluids such as those described, for example, in United States Patents Nos. 3,595~204, 4,020,194 and 4,476,165.
Prior valves for enabling such operation, particularly with longitudinal slot nozzles and the like, as described in said patents, have included two-way poppet valves with a single fluid supply inlet to the valve assembly (such as the type described in "Extruder Valve", a 1977 bulletin of Acu-met-er Laboratories, Inc., the assignee of the present inven-tion), and more recently three-way poppet valve structures enabling precise and constant thickness patterns oE f.luid coating with negligible after-drool and with a very short stroke that permits more rapid on/off cycLe times--such being described in my United States Patent No. 4,5hS,217.
a~;, ',i ~ : -'.`.'i ,..
~1 , ,1"
~2~5356 .
~ hile such and other valving structures are particu-larly suieed to the types of fluid extrusion or deposition nozzles above-referenced and similar extruders, there are occasions where it is desired to spray or even atomize or fiberize the fluid upon the moving web or other surface, which requires the use of finer nozzle orifices and even needle-like nozzles with fine dispensing openings. It is mo}e particularly to the adaption of poppet-valve structures and preferably said three-way poppet valves to such extruding spray-like or atomizing or fiberizing nozzles or heads that the present invention is principally (though not exclusively) directed, such nozzle dispensers having properties and characteristics often quite distinct from the before-men-tioned types of extrusion nozzles.
An object of the present invention, accordlngly, is to provlde a new and improved poppet-valve-controlled fluid nozzle applicator particularly useful, though not exclusi-vely, with such extruded sprav or atomizing type disoells~ng applicators and the like.
A further object is to provide such a novel applicator that operates with a preferred three-way poppet valve.
~ .............. , ; ~ '~, 129~3~
Still another object is to provide a novel applicator for the intermittent (and continuous) extrusion or spray of fluids through fine needle-like nozzles or dispensers; and further, where desired, to enable the shaping, varying or controlling of the fluid spray in a defined manner during the extrusion.
Other and further objects will be explained hereinafter and are more particularly delineated in the appended claims. In summary, therefore, the present invention may be considered as providing a poppet valve-controlled fluid nozzle applicator system having, in combination, a longitudinally extending, reciprocally mounted valve stem carrying a poppet valve constrained within a fluid supply chamber communicating with a pressurized and metered fluid supply source, the poppet valve having a downwardly converging surface terminating in a valve tip; a nozzle mounted to depend from a region of lowermost reciprocation of the valve tip, the nozz:Le having a first passage therein with an opening at an upper end thereof into which the valve tip may fit to block fluid flow from the chamber into the passage when the valve stem reciprocates to a lowermQst position, the valve tip engaging a portion of the nozzle surrounding the opening along a line-contact circle the diameter of which has a magnitude that is a minor portion of the magnitude of the diameter of the poppet valve, the nozzle having a second passage therein that is substantially narrower than the first sd/sp ~2~53~6 passage, the second passage having an upper end that communicates directly with the lower end of the first passage and having a lower end with a fine bottom orifice thro~lgh which fluid exits upon elevation of the valve tip from the region of lowermost reciprocation; a dispensing head disposed about the nozzle and having a bottom aperture in substantial alignment with the bottom orifice of the nozzle, the dispensing head having means for adjusting the position of the dispensing head relative to the nozzle within a range of positions from a position at which the bottom orifice of the nozzle is just above the bottom aperture of the dispensing head, through a position at which the orifice and the aperture are substantially flush with one another, to a position at which the orifice is below the aperture, the nozzle having a conical outer surface with an apex region adjacent to the bottom orifice and the dispensing head having a conical inner surface surrounding and spaced from the conical outer surface of the nozzle and having an apex region adjacent to the bottom aperture; and means for directing air conically convergingly inward in the space between the conical surfaces and thereafter upon fluid exiting from the orifice as the fluid is in free flight therefrom, and in which the nozzle has a cylindrical portion terminating the apex region thereof whereby the conically convergingly inward directed air is redirected along the direction of fluid exiting from sd/~
12g~3~6 the bottom orifice, the diameter of the aperture being greater than the diameter of the cylindrical portion so that the aperture remains open even when said cylindrical portion is within said aperture.
The invention will now be described with reference to the accompanying drawings, Fig. 1 of which is a longitudinal section of the apparatus of the invention in preferred form;
Fig. 2 is an isometric view thereof; and Figs. 3A, 3B and 3C are fragmentary longitudinal sections of different positions of adjustment of the nozzle portion of the apparatus of Figs. 1 and 2;
Fig. 5 is a view similar to Fig. 1 of a two-way poppet valve embodying features of the invention:
Figs. 4 and 6 are respectively system block diagrams showing how the valve-nozzles of Figs. 1 and 5 may be operated for the purposes herein; and sd/~, -4A-129~;3~
Figs. 7A and 7B illustrate metering pump mounting ad-jacent the respective three-way and two-way poppet valve nozzle applicator structures of Figs. 1 and 5 (Figs. 4 and 6).
Referring to the drawings, for illustrative purposes, as before stated, the inventlon is first described in connec-tion with a preferred three way poppet valve of the type dis-clo.sed in said Patent No. 4,565,217, having a housing or body 1 provided with longitudinally extending valve stem or piston 3 axially reciprocally mounted within communicable upper and lower (as shown) longitudinally displaced fluid chambers 5 and 5'. The lower chamber 5' transversely communicates with a fluid supply source at 7', such as a pressurized metered hot melt or other coating fluid or adhesive fluid supply, as described in said patents, for example, and the upper chamber 5, with a fluid return path 7. The valve piston or stem 3 carrie.s at its lower end, ln the orientat:Lon shown, a valve head 9 having upwardly and downwardly conical converging sec-tions 9' and 9" contained within the lower chamber 5'. The upper converging conical section 9', when the stem 3 is reci-procated to its upperntost position, bears agains~ the lower end region 11' of the valve seat opening 11 communcating the . ~ , , .
S~56 lower and upper chambers 5' and 5 to close off such communi-cation. The lower oppositely or downwardly converging coni-cal section 9 of the poppet valve head 9 terminates in a conical tip T that, when the valve stem reciprocates down-wardly to its lowest position or point, enters and blocks off the top of a narrow hollow insert or other recess 13 in the upper portion of a conically terminated extrusion sprav or dispensing nozzle 15. The lnsert or recess 13 communicates dlrectly with a hollow needle-llke thinner tube or stem N
(that may actually be a hyperdermic- like hollow needle or other tube including a tubular recess preformed in the nozzle cone) ln the lower portlon of the nozzle houslng 15 that, when the valve stem tlp T ls elevated to open fluid communi-cation from the lower chamber 5' into the nozzle hollow insert 13, exits fluld through the lower aperture(s) N' of the needle nozzle tube or stem.
Preferably, as shown ln Figs. 1 and 2, an atolllizer head coaxlally surrounds the conical nozzle houslng 15, but with a V-shaped somewhat conlcal space V provlded therebetween for enabling relatlve longltudinal adjustment of the position of the nozzle housing 15 and the aperture A' of the head A and for later-described conical air flow when desired. Such ad-~ustment, as by the threaded section 15', Fig. 2 (or other . , '~ . - ''' ' ' ~2~3~6 adjustable structure including slidable adjustment), ~
control the fluid exiting point of the needle, tube or stem opening(s) N' to recessed positions above the aperture A' of sonewhat larger diameter (Fig. 3A), or to substantial align-ment or a flush position therewith (Fig. 3B), or to extended positions beyond (Fig. 3C), thereby to varying the character of the fluid extrusion for adjustable effects. The recessed position of Fig. 3A has been found to cause the extruded spray to assume a mainly continuous filament or fiber charac-ter as air introduced at 20 and conically intersecting the extruded fluid in free flight outside and below the nozzle opening N', bonds or stretches the fluid into a continuous filament form; the flush position of Fig. 3B, producing a combination of fiber or filaments and droplets; and the extended position o~ Fig. 3C, producing a spray mainly of droplets. This adjustment thus has been found to permit con-trol of the nature of the extruded spray or depositlon and the ratio of fibers-to-droplets, for exampLe.
The valve stem 3 is mechanically reciprocated in the illustrative embodiment of Figs~ 1 and 2 by pneumatic pressurized-fluid means acting first downwardly upon the air ~!
i , :~' ~9~356 piston head 3' of the valve stem or piston 3 from air inlet (outlet) 2 in an air manifold body 4 at the top of the valve body 1, and upwardly on the head 3' from the inlet (outlet) 2'. The head 3' is shown provided with a seal 6 and a lower retaining plate 6' (bearing and seal) held on the upper end of the valve stem 3 by hexagonal nuts and washers 8, 8'.
Upper and lower retaining plates and piston seals are shown at 10, with 'O' rings about the flu~d supply and return pipes 7' and 7; and a further seal washer 12 at an upper flange of the extrusion nozzle 15.
Should further control be desired of the nature, shape and pattern and/or distribution of the fluid deposits (fila-ments or fibers, droplets, etc. or combinations or the same in various proportions) upon the moving web or other surface that may be disposed below the valve-nozzle-aperture head 1-15 (schematically designated by W in Figs. 1 and 2), the atomizer insert A may be coaxially circumscribed, totally or in sectors, by an outer houslng sleeve H. The sleeve H is provided with an air-flow or other fLuid flow passage H' external to the member A, supplied at 22, and that terminates in downwardly and centrally inwardly oriented exiting trim ear portions H' to direct further pressurized air or other ~., ..
~2~3~6 pressurized fluid) axially inwardly, on the fluid filament shown at the region P in Fig. l, well below the nozzle and insert openings N'-A'. The inwardly directed air cone provi-ded through the V channel in A, acting symmetrically below the nozzle openings N' and upon the free-flight extruded fluid spray, may be modified, including directionally deflec-ted, by the supplemental trim ear air at ~', and has been found remarkably to bond continuous very thin filaments or flbers (order of O.Olmm) and/or provide droplets or combina-tions of the same in a controlled and predictable manner to produce the desired coating distribution and dimensions upon the web W, and in either continuous or programmable inter-mittent fashion. Additional air supplied at 24 and from other ears, labelled "FAN EARS" in Fig. 4, not shown in Fig.
1 but in back of and in front the nozzle section 15, disposed 90 circumferentially displaced from H', for example, can further enable pattern deflection and containing.
For intermittent operation of the poppet or slmllar valve 1, it has been found possible even to obtain substan-tially the same fiber or filament uniform coating patterns of, for example, hot melt elastomeric rubber, acrylic or ethelyne vinyl acetate, etc., such as, for example, Findlay 3 29~3~i Company Type 990-3346, irrespective of intermittency fre-quency (with fluLd volume extrusion synchronized with ~eb speed and synchronized air flow volumes/velocity, where used) over wide ranges of such speeds ranging from about 15 to hi~h 180 meters/minute line speeds, more or less. A hollow needle stem applicator N about lO mm long and 0.35 mm ln diameter, communicating with a carbide wear-resistant insert 13 of about 0.75 mm insider diameter, is useful for this applica-tion, with fiber-to-droplet ad~ustments ranging from about 0.457 mm above A (Fig. 3A) to about 0.457 mm beyond A (Fig.
3C). Air-shaping by air flow volume ranging from about 12 to about 65 liters per minute, directed, for example, at P, approximately 6 mm below th4 point of release of the fluid, has been found to distribute continuous fibers of the order of 0.01 mm thick over patterns ranging from about 6 mm to 38 mm in width, more or less--and with sharp cut-on and cut-off edges, even at high line speeds, for intermittent operation.
The relatlvely remote position oE the fluid nozzle in my prior U.S. Patent No. 4,565,217 enabled separation by an intermediate fluicl discharge plate; but the additional capa-citance effect caused by the remote nozzle positioning was found in some instances to cause heavy droplets of coating flu$d when the valve is closed. At high reciprocation rates, "~
'~ '''1.~ i ~2~ 6 moreover, the "punching" action induces fluid column effects that drive additional fluld through the nozzle during the closlng action.
For avoiding such effects, the present invention on the other hand, in effect imbeds the fluid nozzle structure 15 into the poppet valve fluid supply chamber 5' and enables direct contact with the poppet valve stem 3, with the dimen-sions of the hollow insert 13 and the preferably narrower needle tube applicator N ad~usted such that the before-men-tloned addltional capacitance of my prior system is entirely obviated and no spurious fluid droplet deposits after valve closure result. The design thus provides for less fluid dis-placement during valve closure. In addition the valve stem reciprocating stroke of the present invention has been reduced (to the order of 0.020"--about one-third of that used in prior commercial forms of my before-described patented three-way poppet valve) which prevents any fluid column effect emanating from longer stroke inducement of addltional fluid displacement through the nozzle.
A preferred system for operatlng the poppet-valve-nozzle sy~tem of Figs. l and 2 is shown in Fig. 4, wlth the valve assembly 1 qhown supplied by hot melt supply line 7' from the positive displacement metering pump MP, driven by a '~ ~r .
! .~ '.
',~ ,/
~z~a~3~6 ~12-digital motor drive under the control of a speed control con-nected with a web-speed pick-up sensor, in conventional fashion, as so-labelled, for preferred synchronous meter fluLd volume and web line speed. The air supplied at A' via line ZO ("CONE") and at H' via line 22 (and, if used, from the before-mentioned "FAN EARS") is heated at H in view of the hot melt fluid useage, and its flow (volume/velocity) is also preferably synchronously (proportionally) controlled with fluid volume and web line speed at S.
While the three-way poppet valve herein-described with direct supply line 7' and return 7 to the hot melt source or tank is preferred, the novel nozzle-valve construction and also the novel air interaction structures, if used, may also be employed with two-way poppet valve constructions, though this is not considered as operationally desirable as the three-way valve. Thus, a two-way poppet valve construction is shown in Fig. 5, otherwise slmilar to the three-way poppet valve of Figs. 1 and 2, but with a closed upper fluid chamber 5" that is not returned by a return outlet 7 as in the system of Fig. 4. Instead, the two-way valve system is provided in the supply line 7', Fig. 6, with a pressure relief valve PR
designed to operate open for fluid passage when the two-way poppet valve is closed for intermittent ON/OFF operation, and . .
.~
.~ ,. . ~.
~L~9~;3~6 is connected back to the delivery reservoir or supply tank.
During closure of the two-way poppet valve, the PR vaLve will redirect the supply fluid to the reservoir tank. Under cer-tain conditions, the combination of such a two-way poppet valve, together with PR valve, will provide for reasonable satisfactory operation, effective up to the point when the PR
valve becomes operational, and therefore partially or totally directing all fluid through the PR valve and no fluid to the head 1, by-passing the head and supply chamber 5'.
For excellent uniform hot melt thin fiber-filament coatings, moreover, it has been found important to locate the poppet-valve fluid metering pump right at, or adjacent the poppet valve 1. The mounting of the metering pump to the valve assembly is therefore shown in Figs. 7A and 7B for the three-way and two-way poppet valve assemblies of Figs. 1 and 5 (Figs. 4 and 6), respectively.
Further modifications will occur to those skilled in this art, including the use of other types oE vaLving (though generally properly generically describable of "poppet"-type), and other types of fine spray nozzles or orifices, and such are considered to fall withln the spirit and scope of the invention as defined in the appended claims.
~1` ' ,'
Claims (15)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS
FOLLOWS:
1. A poppet valve-controlled fluid nozzle applicator system having, in combination, a longitudinally extending valve stem reciprocally mounted within communicable upper and lower longitudinally displaced fluid chambers, the lower of which transversely communicates with a pressurized and metered fluid supply source and the upper of which communicates transversely with a fluid return path, the valve stem carrying a poppet valve having upwardly and downwardly converging surfaces and constrained within the lower chamber, the region of communicating of the upper and lower chambers comprising a valve seat against which the upwardly converging surface of the poppet valve may bear to close off the upper chamber from the lower chamber when the valve stem reciprocates to an uppermost position, the downwardly converging surface of the poppet valve terminating in a valve tip;
a nozzle mounted to depend from a region of lowermost reciprocation of the valve tip, said nozzle having a first passage therein with an opening at an upper end thereof into which the valve tip may fit to block fluid flow from the lower chamber into said passage when the valve stem reciprocates to a lowermost position, said valve tip engaging a portion of said nozzle surrounding said opening along a line-contact circle the diameter of which has a magnitude that is a minor portion of the (claim 1 continued) magnitude of the diameter of said poppet valve, said nozzle having a second passage therein that is substantially narrower than the first passage, said second passage having an upper end that communicates directly with the lower end of said first passage and having a lower end with a fine bottom orifice through which fluid exits upon elevation of the valve tip from said region of lowermost reciprocation; a dispensing head disposed about said nozzle and having a bottom aperture in substantial alignment with the bottom orifice of the nozzle, said dispensing head having means for adjusting the position of said dispensing head relative to said nozzle within a range of positions from a position at which said bottom orifice of said nozzle is just above said bottom aperture of said dispensing head, through a position at which said orifice and said aperture are substantially flush with one another, to a position at which said orifice is below said aperture, said nozzle having a conical outer surface with an apex region adjacent to said bottom orifice and said dispensing head having a conical inner surface surrounding and spaced from said conical outer surface of said nozzle and having an apex region adjacent to said bottom aperture; and means for directing air conically convergingly inward in the space between said conical surfaces and thereafter upon fluid exiting from said orifice as the fluid is in free flight therefrom, and in which said nozzle has a cylindrical portion terminating said apex region thereof whereby said conically convergingly inward directed air is redirected along the direction of fluid exiting from said bottom orifice, the diameter of said aperture being greater than the diameter of said cylindrical portion so that said aperture remains open even when said cylindrical portion is within said aperture.
a nozzle mounted to depend from a region of lowermost reciprocation of the valve tip, said nozzle having a first passage therein with an opening at an upper end thereof into which the valve tip may fit to block fluid flow from the lower chamber into said passage when the valve stem reciprocates to a lowermost position, said valve tip engaging a portion of said nozzle surrounding said opening along a line-contact circle the diameter of which has a magnitude that is a minor portion of the (claim 1 continued) magnitude of the diameter of said poppet valve, said nozzle having a second passage therein that is substantially narrower than the first passage, said second passage having an upper end that communicates directly with the lower end of said first passage and having a lower end with a fine bottom orifice through which fluid exits upon elevation of the valve tip from said region of lowermost reciprocation; a dispensing head disposed about said nozzle and having a bottom aperture in substantial alignment with the bottom orifice of the nozzle, said dispensing head having means for adjusting the position of said dispensing head relative to said nozzle within a range of positions from a position at which said bottom orifice of said nozzle is just above said bottom aperture of said dispensing head, through a position at which said orifice and said aperture are substantially flush with one another, to a position at which said orifice is below said aperture, said nozzle having a conical outer surface with an apex region adjacent to said bottom orifice and said dispensing head having a conical inner surface surrounding and spaced from said conical outer surface of said nozzle and having an apex region adjacent to said bottom aperture; and means for directing air conically convergingly inward in the space between said conical surfaces and thereafter upon fluid exiting from said orifice as the fluid is in free flight therefrom, and in which said nozzle has a cylindrical portion terminating said apex region thereof whereby said conically convergingly inward directed air is redirected along the direction of fluid exiting from said bottom orifice, the diameter of said aperture being greater than the diameter of said cylindrical portion so that said aperture remains open even when said cylindrical portion is within said aperture.
2. An apparatus as claimed in claim 1 and in which means is provided for rapidly and intermittently reciprocating the valve stem and poppet valve to cause intermittent flow of fluid through said bottom orifice of the nozzle.
3. An apparatus as claimed in claim 1 and in which means is provided for driving the valve stem to its uppermost position to permit a continuous flow of fluid through the bottom orifice of said nozzle until the valve stem is reciprocated to its lowermost position.
4. An apparatus as claimed in claim 1 and in which said nozzle comprises wear-surface material, such as carbide steel, for engagement with said valve tip.
5. An apparatus as claimed in claim 1 and in which the valve stem reciprocation is controlled by pressurized-fluid means.
6. An apparatus as claimed in claim 1 and in which means is provided for directing air conically convergingly inward upon fluid exiting from said aperture of said dispensing head as the fluid is in free flight therefrom.
7. An apparatus as claimed in claim 1 and in which said fluid supply source comprises metering pump means, said valve stem reciprocates in a housing containing said chambers, and said metering pump means is mounted on said housing.
8. A poppet valve-controlled fluid nozzle applicator system having, in combination, a longitudinally extending, reciprocally mounted valve stem carrying a poppet valve constrained within a fluid supply chamber communicating with a pressurized and metered fluid supply source, said poppet valve having a downwardly converging surface terminating in a valve tip; a nozzle mounted to depend from a region of lowermost reciprocation of the valve tip, said nozzle having a first passage therein with an opening at an upper end thereof into which the valve tip may fit to block fluid flow from said chamber into said passage when the valve stem reciprocates to a lowermost position, said valve tip engaging a portion of said nozzle surrounding said opening along a line-contact circle the diameter of which has a magnitude that is a minor portion of the magnitude of the diameter of said poppet valve, said nozzle having a second passage (claim 8 continued) therein that is substantially narrower than the first passage, said second passage having an upper end that communicates directly with the lower end of said first passage and having a lower end with a fine bottom orifice through which fluid exits upon elevation of the valve tip from said region of lowermost reciprocation;
a dispensing head disposed about said nozzle and having a bottom aperture in substantial alignment with the bottom orifice of the nozzle, said dispensing head having means for adjusting the position of said dispensing head relative to said nozzle within a range of positions from a position at which said bottom orifice of said nozzle is just above said bottom aperture of said dispensing head, through a position at which said orifice and said aperture are substantially flush with one another, to a position at which said orifice is below said aperture, said nozzle having a conical outer surface with an apex region adjacent to said bottom orifice and said dispensing head having a conical inner surface surrounding and spaced from said conical outer surface of said nozzle and having an apex region adjacent to said bottom aperture; and means for directing air conically convergingly inward in the space between said conical surfaces and thereafter upon fluid exiting from said orifice as the fluid is in free flight therefrom, and in which said nozzle has a cylindrical portion terminating said apex region thereof whereby said conically convergingly inward directed air is redirected along the direction of fluid exiting from said bottom orifice, the diameter of said aperture being greater than the diameter of said cylindrical portion so that said aperture remains open even when said cylindrical portion is within said aperture.
a dispensing head disposed about said nozzle and having a bottom aperture in substantial alignment with the bottom orifice of the nozzle, said dispensing head having means for adjusting the position of said dispensing head relative to said nozzle within a range of positions from a position at which said bottom orifice of said nozzle is just above said bottom aperture of said dispensing head, through a position at which said orifice and said aperture are substantially flush with one another, to a position at which said orifice is below said aperture, said nozzle having a conical outer surface with an apex region adjacent to said bottom orifice and said dispensing head having a conical inner surface surrounding and spaced from said conical outer surface of said nozzle and having an apex region adjacent to said bottom aperture; and means for directing air conically convergingly inward in the space between said conical surfaces and thereafter upon fluid exiting from said orifice as the fluid is in free flight therefrom, and in which said nozzle has a cylindrical portion terminating said apex region thereof whereby said conically convergingly inward directed air is redirected along the direction of fluid exiting from said bottom orifice, the diameter of said aperture being greater than the diameter of said cylindrical portion so that said aperture remains open even when said cylindrical portion is within said aperture.
9. An apparatus as claimed in claim 8 and in which means is provided for rapidly and intermittently reciprocating the valve stem and poppet valve to cause intermittent flow of fluid through said bottom orifice of the nozzle.
10. An apparatus as claimed in claim 8 and in which means is provided for driving the valve stem to its uppermost position to permit a continuous flow of fluid through the bottom orifice of said nozzle until the valve stem is reciprocated to its lowermost position.
11. An apparatus as claimed in claim 8 and in which said nozzle comprises wear-surface material, such as carbide steel, for engagement with said valve tip.
12. An apparatus as claimed in claim 8 and in which the valve stem reciprocation is controlled by pressurized-fluid means.
13. An apparatus as claimed in claim 8 and in which means is provided for directing air conically convergingly inward upon fluid exiting from said aperture of said dispensing head as the fluid is in free flight therefrom.
14. An apparatus as claimed in claim 8 and in which the fluid supply source comprises metering pump means connected to said chamber by a supply line and provided with a by-pass through a pressure relief valve.
15. An apparatus as claimed in claim 8 and in which said valve stem reciprocates in a housing containing said chamber and said metering pump is mounted on said housing.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US3626987A | 1987-04-09 | 1987-04-09 | |
| US036,269 | 1987-04-09 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1295356C true CA1295356C (en) | 1992-02-04 |
Family
ID=21887646
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000562976A Expired - Lifetime CA1295356C (en) | 1987-04-09 | 1988-03-30 | Poppet-valve-controlled fluid nozzle applicator |
Country Status (9)
| Country | Link |
|---|---|
| EP (1) | EP0286212A3 (en) |
| JP (1) | JPS63315168A (en) |
| KR (1) | KR880012275A (en) |
| CN (1) | CN1012715B (en) |
| AU (1) | AU613354B2 (en) |
| BR (1) | BR8801692A (en) |
| CA (1) | CA1295356C (en) |
| FI (1) | FI881509A (en) |
| IL (1) | IL85854A (en) |
Families Citing this family (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB8913400D0 (en) * | 1989-06-10 | 1989-08-02 | Woodward William H | Fluid flow value |
| DE4211942C2 (en) * | 1992-04-09 | 1995-09-07 | Wallner Harald | Glue application valve |
| DE9414218U1 (en) * | 1994-09-02 | 1994-11-03 | Altek Allg Landtech | Pressure regulator for a mobile agricultural discharge device |
| ATE330495T1 (en) | 2003-01-31 | 2006-07-15 | Hauni Maschinenbau Ag | METHOD FOR GLUING A MOVING WEB, AND DEVICE, IN PARTICULAR FOR IMPLEMENTING THE METHOD |
| US7070066B2 (en) * | 2004-04-08 | 2006-07-04 | Nordson Corporation | Liquid dispensing valve and method with improved stroke length calibration and fluid fittings |
| US20060097010A1 (en) * | 2004-10-28 | 2006-05-11 | Nordson Corporation | Device for dispensing a heated liquid |
| JP2006218450A (en) * | 2005-02-14 | 2006-08-24 | Pauretsuku:Kk | Spray gun |
| US20080217360A1 (en) * | 2007-03-05 | 2008-09-11 | Illinois Tool Works Inc. | Hot melt adhesive dispensing valve or module assembly having a module filter disposed therewithin |
| CN102233222A (en) * | 2010-04-26 | 2011-11-09 | 江苏博际环保工程有限公司 | Water drop grid device |
| DE202011107265U1 (en) | 2011-10-31 | 2013-02-11 | Nordson Corporation | Dispensing module, applicator head and nozzle for dispensing a fluid, in particular hot melt adhesive |
| BR112016007531A2 (en) * | 2013-10-11 | 2017-08-01 | 3M Innovative Properties Co | nozzle systems and assemblies and related methods |
| US11073279B2 (en) * | 2016-08-23 | 2021-07-27 | Fisher Controls International Llc | Multi-cone, multi-stage spray nozzle |
| JP6948702B2 (en) * | 2017-08-29 | 2021-10-13 | 株式会社レクシー | High-pressure discharge device |
| CN114247577A (en) * | 2022-02-28 | 2022-03-29 | 江苏高凯精密流体技术股份有限公司 | Positive displacement constant pressure coating device |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3108793C2 (en) * | 1981-03-07 | 1985-01-17 | Bima Maschinenfabrik Gmbh, 7450 Hechingen | Adhesive applicator, in particular for the leather goods and shoe industry |
| US4565217A (en) * | 1983-06-30 | 1986-01-21 | Acumeter Laboratories, Inc. | Three-way poppet valve, method and apparatus |
-
1988
- 1988-02-17 EP EP88301300A patent/EP0286212A3/en not_active Withdrawn
- 1988-03-24 IL IL85854A patent/IL85854A/en unknown
- 1988-03-30 CA CA000562976A patent/CA1295356C/en not_active Expired - Lifetime
- 1988-03-30 FI FI881509A patent/FI881509A/en not_active IP Right Cessation
- 1988-03-31 AU AU14077/88A patent/AU613354B2/en not_active Ceased
- 1988-04-08 CN CN88101803A patent/CN1012715B/en not_active Expired
- 1988-04-08 JP JP63087054A patent/JPS63315168A/en active Pending
- 1988-04-08 BR BR8801692A patent/BR8801692A/en unknown
- 1988-04-09 KR KR1019880004079A patent/KR880012275A/en not_active Application Discontinuation
Also Published As
| Publication number | Publication date |
|---|---|
| CN1012715B (en) | 1991-06-05 |
| JPS63315168A (en) | 1988-12-22 |
| CN88101803A (en) | 1988-10-26 |
| AU1407788A (en) | 1988-10-13 |
| FI881509A (en) | 1988-10-10 |
| BR8801692A (en) | 1988-11-16 |
| IL85854A (en) | 1991-12-15 |
| AU613354B2 (en) | 1991-08-01 |
| IL85854A0 (en) | 1988-09-30 |
| KR880012275A (en) | 1988-11-26 |
| EP0286212A2 (en) | 1988-10-12 |
| FI881509A0 (en) | 1988-03-30 |
| EP0286212A3 (en) | 1989-08-30 |
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