WO1989003804A1 - Procede et appareil de distribution de mousse phenolique - Google Patents

Procede et appareil de distribution de mousse phenolique Download PDF

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Publication number
WO1989003804A1
WO1989003804A1 PCT/US1988/003575 US8803575W WO8903804A1 WO 1989003804 A1 WO1989003804 A1 WO 1989003804A1 US 8803575 W US8803575 W US 8803575W WO 8903804 A1 WO8903804 A1 WO 8903804A1
Authority
WO
WIPO (PCT)
Prior art keywords
fluid
nozzle
mixing chamber
components
valve means
Prior art date
Application number
PCT/US1988/003575
Other languages
English (en)
Inventor
Thomas John Blackwood-Murray
Kenneth Arthur Gascoyne
Original Assignee
Heitzer Phenolics, Inc.
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 Heitzer Phenolics, Inc. filed Critical Heitzer Phenolics, Inc.
Publication of WO1989003804A1 publication Critical patent/WO1989003804A1/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B7/00—Mixing; Kneading
    • B29B7/74—Mixing; Kneading using other mixers or combinations of mixers, e.g. of dissimilar mixers ; Plant
    • B29B7/7438—Mixing guns, i.e. hand-held mixing units having dispensing means

Definitions

  • This invention relates to foam dispensing guns and, more particularly, it concerns low-cost, limited use dispensing guns especially suited for spraying phenolic foams using resin/catalyst components prefera ⁇ bly supplied in pressurized containers forming part of a foam dispensing kit which includes the gun as well as a supply of disposable mixing nozzles each replaceably attachable to the gun to avoid the necessity for cleaning thereof.
  • foam dispensing guns were developed for use with and have been highly successful commercially in prepackaged foam kits which include two pressurized containers of foam forming chemicals or resins, a dispensing gun and other supplies incidental to use of the kit, such as hoses for attaching the gun to the containers, petroleum jelly for facilitating and assuring sealed connections of couplings, solvent for cleaning gun parts, and a plurality of nozzles adapted for easy replacement in the gun.
  • the resins are supplied separately in the two containers and are typically polymeric isocyanate and polyol amine, respectively.
  • the two fluid com ⁇ ponents or resins are mixed, the mixture quickly sets up to form a rigid foam product which is substantially insoluble and extremely difficult, if not impossible, to remove from surfaces with which it comes in contact. Because of these characteristics, the nozzles for the gun are designed to be replaceable and disposable in order to avoid the necessity for cleaning any part of the gun which comes into contact with mixed, as distin ⁇ guished from separate, foam producing fluid components.
  • the invention provides the improvement that an inert fluid, such as air, is introduced to the nozzle along a third flow line controlled by a valve which is also operated by means of a trigger, the third valve being arranged on trigger operation to open prior to the first and second valves and on trigger release to close after the first and second valves so that the inert fluid flows through the nozzle before the resin and catalyst components and purges the nozzle to an extent after flow of the resin and catalyst components has ceased.
  • an inert fluid such as air
  • valves are needle valves having stems arranged to be acted upon by a single trigger, the stem of the needle valve controlling the third flow line being arranged to be acted upon first and to be released last by the trigger.
  • a preferred application of the foam dispensing gun specified above is in dispensing phenolic foams.
  • Another aspect of the invention provides a method of dispensing a foam, the method comprising the steps of introducing resin and catalyst components to a mixing nozzle, mixing these components in the nozzle and dispensing them from the nozzle, wherein the method comprises the further steps of introducing an inert fluid to the mixing nozzle prior to the introduction of the resin and catalyst components, maintaining the introduction of such inert fluid to the nozzle through- out the introduction of the resin and catalyst com ⁇ ponents, and terminating the introduction of such gas after the introduction of the resin and catalyst components has ceased.
  • Yet another aspect of the invention provides a method of operating a foam dispensing gun of the kind having a mixing nozzle and first and second flow lines for the introduction to the nozzle of resin and catalyst components, the method comprising the steps of introduc ⁇ ing an inert fluid to the nozzle along a third flow line prior to the introduction of the resin and catalyst co - ponents, of maintaining the introduction of such inert fluid throughout the introduction of the resin and catalyst components, and of terminating the introduction of such gas after the introduction of the resin and catalytic components has ceased.
  • a still further aspect of the invention provides a foam dispensing kit which comprises a foam dispensing gun as specified above, separate pressurized containers of resin, of catalyst and of the inert fluid, and conduits for conveying the resin, catalyst and inert fluid separately from their containers to the gun.
  • the preferred resin : catalyst mixing ratio will be about 2:1 and it is accordingly preferred that the capacity of the resin container be approximately twice that of the catalyst container.
  • the nozzle may be fitted with a rotatable mixing rotor and the gun with a motor to which the rotor is detachably chucked.
  • the motor may be a pneumatic motor and the inert gas may be air in which case the motor may be powered by the inert gas supply.
  • the invention accord ⁇ ingly extends to a nozzle fitted with a rotor which can be chucked to a motor forming part of the foam dispen ⁇ sing gun.
  • the invention also extends to a nozzle for a phenolic foam dispensing gun, the nozzle having a dis ⁇ pensing spout whose diameter is at least about 9mm and whose length:diameter ratio is preferably at least about :1.
  • Fig. 1 is a side view of a preliminary design embodiment of a foam dispensing gun of the present invention
  • Fig. 2 is a front face view of the handle of the gun shown in Fig. 1 with the trigger and breech removed
  • Fig. 3 is a top view of the gun shown in Fig. 2
  • Fig. 4 is a section through a mixing nozzle used - with the embodiment of Fig. 1
  • Fig. 5 is a generally schematic illustration of a foam dispensing kit incorporation a preferred embodiment of the present invention
  • Fig. 6 is an enlarged, stepped cross section of the gun shown in Fig. 5;
  • Fig. 7 is a top view of the body of the gun shown in Fig. 6 with the nozzle, breech and valves removed; and
  • Fig. 8 is a cross section on line 8 - 8 of Fig. 7.
  • Figs. 1 to 4 show a foam dispensing gun of a design similar to that disclosed in U.S. patent No. 4,399,930 but modified by the improvements brought about by the present invention. It has a handle 10 to which are connected three flow lines in place of the normal two. The third flow line 11 comes in at a lower level than the other two marked 12 and 13 in Figs. 1 and 3. Resin flows along the line 12, catalyst along the line 13 and an inert fluid along the line 11.
  • the inert fluid preferably a gas, may be air supplied from a pressure cylinder or some other source of compressed air.
  • inert fluid nitro- gen, refrigerant gas or vapors such as steam.
  • the inert fluid operates as nucleating agent during operation of the gun to dispense foam to insure intimate mixing of the resin and catalyst components.
  • the handle 10 is provided with a breech 15 and a trigger 16. The latter is prevented from operation by a safety catch 17 in a known manner.
  • the breech accepts a disposable mixing nozzle 18 and carries a small stirrer motor 19 which may be air operated from the source that supplies the line 11.
  • the lines 11, 12 and 13 are controlled by needle type valves 20, 21 and 22.
  • the valve 20 is an addition to the known gun. Its operating pin projects further than the pins of the valves 21 and 22.
  • the spigot 24 of the valve 20 is the rearmost to ensure that the nozzle 18 is air purged along its whole length.
  • the nozzle 18 is formed with a body in which there is rotatably mounted a mixing rotor 28.
  • the shaft of the rotor 28 projects fro the nozzle 18 and is shaped to be chucked by a chuck on the motor 19.
  • the nozzle 18 has a dispensing spout 29.
  • the lines 11, 12, 13 are connected to their respective sources with the catch 17 on.
  • a nozzle 18 is loaded by pulling the breech 16 backwardly and positioning three orifices on the nozzle over the spigots 24. The breech is then moved forwardly for the motor 19 to chuck the rotor 28 and for the breech 15 to engage with and hold the nozzle 18 firmly in position similar to the known gun.
  • the trigger 16 may be pressed to start foam dispensing operations. As this happens, compressed air will first enter and pass through the nozzle 18. After that resin and catalyst enter the nozzle 18 where they are mixed with the air by the action of the air and the rotation of the rotor 28.
  • FIGs. 5 to 8 of the drawings a more refined design and preferred embodiment of the invention is shown. This embodiment is the result of experimentation with and modification of prototypes beginning with the embodiment of Figs. 1 to 4.
  • parts similar to parts previously described with reference to Figs. 1 to 4 will be designated by the same reference numerals but in a "100" series.
  • New parts in the embodiment of Figs. 5 to 8, not previously identified in Figs. 1 to 4 will be designated by new reference numerals in the same series.
  • Fig. 5 to 8 not previously identified in Figs. 1 to 4
  • a dispensing gun generally designated by the reference numeral 109
  • the pressurized containers are packaged in a common receptacle or box 135 depicted by dashed lines in Fig. 5 and constituting a portable supply of the chemical components supplied with the gun 109 as a kit and to be dispensed from the gun 109 as phenolic foam.
  • the container 132 represents a pressurized supply of a resin component
  • the container 134 a pressurized supply of a catalyst component
  • the container 130 a supply of compressed air.
  • Each of the containers includes a discharge conduit 136, 138 and 140 for connection to the respective hoses 111, 112, and 113, the conduits, in turn, being controlled by valves 142, 144, and 146, respectively.
  • the dispensing gun 109 has a single, multi- port spigot 148 extending upwardly from the handle 110. This spigot is received as a tight friction fit in a single port 150 at the rear end of the replaceable nozzle 118. It will be noted that the single port 150 has an inwardly directed annular rib 151 sized to make a tight fit on the spigot 148.
  • the handle 110 is formed with three stepped bores 158, 160 and 162 extending through it from the front face 151 to the rear face 149 of the handle. Each bore accommodates a valve body 152, 154 or 156.
  • the valve bodies 152, 154 and 156 are identical and the following description pertaining to the valve body 152 is appli ⁇ cable to all three valve bodies and their associated components.
  • the valve body 152 has a longitudinal passage 155 extending through it in which the needle valve 120 can slide. At its rear end, the body 152 is formed with external barbs 157 and with an internal taper 159 on which the rear end of the needle valve 120 seats under the action of a compression spring 161 which biases the needle valve to the left in Fig. 6. Intersecting the longitudinal passage 155 is a transverse passage 163 which is situated between spaced ribs 165 mounting o- rings 167 at their peripheries. In the installed positioned of the valve body 152, as illustrated, the 0- rings seal against the wall of the bore 158 on opposite sides of an opening 169 leading into the spigot 148.
  • the hose 111 is connected to the barbed rear end of the valve body 152.
  • the trigger 116 when the trigger 116 is moved to the right in Fig. 6 it will act on the protruding of the needle valve 120 and push it to the right, unseating it from the taper seat 159 to establish a fluid flowpath from the hose 111 through the passage 155, through the passage 163 to the spigot 148 and hence to the nozzle 118.
  • the spring 161 will urge the needle valve back to the left to reseat it.
  • the interior of the spigot 148 is divided into three separate ports 164, 166 and 168, which communicate with the bores 158, 160 and 162 respectively and hence which are controlled by the needle valves 120, 121 and 122 respectively.
  • the size of the container 132 for the phenolic resin component is larger than the containers 130 and 134 for compressed air and a catalyst, respectively.
  • the ratio of the phenol-formaldehyde resin blend supplied in the container 132 and the acid catalyst supplied in the container 134 should be at least approximately 2:1.
  • the resin container 132 is approximately twice the size of the catalyst container 134.
  • a restrictor 170 having an orifice 172 of a diameter d ⁇ is mounted in the catalyst supply hose 113 near the inlet end of the valve body 156.
  • the diameter of the orifice 172 found to provide good results in practice is of the order of 1,0mm.
  • the compressed air supplied in the tank 130 is essential to mixing the resin and catalyst components of the system.
  • a restrictor 174 having an orifice 176 is placed in the compressed air line 111 near the inlet end of the valve body 152.
  • the diameter d2 of the orifice 176 of approximately 0.3 mm has been found optimum where the air container or cylinder 130 is pressurized to 3,lMPa.
  • both chemical containers 132 and 134 are pressurized to -12-
  • the minimal diameter d 3 of the nozzle is approximately 9mm.
  • the chemical components have a tendency to set up inside the nozzle and ultimately block passage of material from the gun.
  • the nozzle 118 accommodates a spiral mixer 175 which enhances the turbulence of the flow in the nozzle and hence improves the mixing of the components.
  • the spiral mixer 175 could be replaced by a rotor of the kind described in relation to Figs. 1 to 4.
  • the dispensing spout of the nozzle is relatively long in relation to its diameter. Experimen ⁇ tation indicates that a length:diameter ratio of at least 3:1, and possibly as much as 6:1, works well in practice.
  • 5 to 8 is the provision of a pressure release facility in the control valve 142 serving the pres ⁇ surized air container 130, the object of the pressure release facility being to prevent excessive pressure build-up in the container 130 in the even-c of, say, a fire close to the container package.
  • nozzle 18 has protruding stubs 50 which locate in cam-shaped cut-outs in the breech 15.
  • the purpose of these stubs and cut-outs is described fully in the specification of US patent 4,399,930 referred to previously.
  • a similar nozzle locking arrangement could be provided in that embodiment as well.
  • the rotor 28 has vanes which are designed to urge the materials to flow in laminar fashion and further vane portions, reversed with respect to the vanes, which create turbulence.
  • This kind of rotor has been found to work well in practice.
  • a rotor of this kind could be incorporated in the second embodiment of Figs. 5 to 8 in place of the spiral 175.
  • the spiral 175 could be replaced by a stationary spiral having the same con ⁇ figuration as the rotor.
  • the second embodiment of Figs. 5 to 8 could have an arrangement of three spigots, similar to the spigots 24 in the first embodiment, in place of the single spigot 48.
  • the nozzle would then have three orifices each for receiving one of the spigots, in the same way as the first embodiment.
  • the air spigot would, as in the first embodiment, be the rearmost spigot so that the nozzle is air purged along its full length.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Nozzles (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)

Abstract

Procédé et appareil de distribution de mousse phénolique selon lesquels un composant de résine phénolique et un composant catalytique acide sont stockés séparément dans des réservoirs (132 et 134) pour l'approvisionnement d'un pistolet distributeur (10, 109) à l'aide d'un agent de nucléation. Etant donné que la mousse se durcit rapidement, l'invention résout le problème de durcissement de la mousse lorsque celle-ci se trouve encore à l'intérieur de la chambre de mélange et du pistolet en permettant à des vannes ou orifices (20, 120) pour l'agent de nucléation de rester ouvertes après la fermeture des vannes ou orifices (21, 121, 22, 122) de la résine de manière à nettoyer efficacement la chambre de mélange.
PCT/US1988/003575 1987-10-21 1988-10-18 Procede et appareil de distribution de mousse phenolique WO1989003804A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
ZA87/7910 1987-10-21
ZA877910 1987-10-21
ZA88/4003 1988-06-06
ZA884003 1988-06-06

Publications (1)

Publication Number Publication Date
WO1989003804A1 true WO1989003804A1 (fr) 1989-05-05

Family

ID=27138582

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1988/003575 WO1989003804A1 (fr) 1987-10-21 1988-10-18 Procede et appareil de distribution de mousse phenolique

Country Status (2)

Country Link
AU (1) AU2615288A (fr)
WO (1) WO1989003804A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0500272A1 (fr) * 1991-02-19 1992-08-26 Pmc, Inc. Pistolet de pulvérisation pneumatique
US5344051A (en) * 1992-04-27 1994-09-06 Insta-Foam Products, Inc. Two-component foam dispensing apparatus
WO1997026086A2 (fr) * 1996-01-19 1997-07-24 S.C. Johnson & Son, Inc. Systeme de dosage variable a deux pistons
FR2818241A1 (fr) * 2000-11-17 2002-06-21 Ehrensperger C Ag Procede de remplissage d'un recipient avec melange constitue de deux composants monomeres et/ou oligomeres

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2717806A (en) * 1950-06-05 1955-09-13 Robert G Dale Dual valve for hot or cold water and mixing thereof
US3741441A (en) * 1970-12-02 1973-06-26 W Eberle Method and apparatus for dispensing epoxy
US3784110A (en) * 1972-11-16 1974-01-08 W Brooks Mixing and dispensing gun having a replaceable nozzle
US4285446A (en) * 1979-06-22 1981-08-25 Ransburg Corporation Automatic purging system having a pressure sensor and a timing mechanism
US4311254A (en) * 1980-06-16 1982-01-19 Universal Foam Systems, Inc. Foam dispensing gun
US4471887A (en) * 1982-04-26 1984-09-18 Component Management Corp. Dispensing device
US4523696A (en) * 1984-04-13 1985-06-18 Gusmer Corporation Apparatus for dispensing a mixture of mutually reactive liquids
US4660771A (en) * 1983-09-27 1987-04-28 Sames S.A. Electrostatic painting apparatus

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2717806A (en) * 1950-06-05 1955-09-13 Robert G Dale Dual valve for hot or cold water and mixing thereof
US3741441A (en) * 1970-12-02 1973-06-26 W Eberle Method and apparatus for dispensing epoxy
US3784110A (en) * 1972-11-16 1974-01-08 W Brooks Mixing and dispensing gun having a replaceable nozzle
US3784110B1 (fr) * 1972-11-16 1984-12-04
US4285446A (en) * 1979-06-22 1981-08-25 Ransburg Corporation Automatic purging system having a pressure sensor and a timing mechanism
US4311254A (en) * 1980-06-16 1982-01-19 Universal Foam Systems, Inc. Foam dispensing gun
US4471887A (en) * 1982-04-26 1984-09-18 Component Management Corp. Dispensing device
US4660771A (en) * 1983-09-27 1987-04-28 Sames S.A. Electrostatic painting apparatus
US4523696A (en) * 1984-04-13 1985-06-18 Gusmer Corporation Apparatus for dispensing a mixture of mutually reactive liquids

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0500272A1 (fr) * 1991-02-19 1992-08-26 Pmc, Inc. Pistolet de pulvérisation pneumatique
US5344051A (en) * 1992-04-27 1994-09-06 Insta-Foam Products, Inc. Two-component foam dispensing apparatus
WO1997026086A2 (fr) * 1996-01-19 1997-07-24 S.C. Johnson & Son, Inc. Systeme de dosage variable a deux pistons
WO1997026086A3 (fr) * 1996-01-19 1997-09-18 Johnson & Son Inc S C Systeme de dosage variable a deux pistons
AU721420B2 (en) * 1996-01-19 2000-07-06 Diversey, Inc. Dual piston variable proportioning system
US6036057A (en) * 1996-06-14 2000-03-14 S.C. Johnson Commercial Markets, Inc. Dual piston variable proportioning system
FR2818241A1 (fr) * 2000-11-17 2002-06-21 Ehrensperger C Ag Procede de remplissage d'un recipient avec melange constitue de deux composants monomeres et/ou oligomeres
BE1015003A5 (fr) * 2000-11-17 2004-08-03 Ehrensperger C Ag Procede de remplissage d'un recipient avec un melange constitue de deux composants monomeres et/ou oligomeres.

Also Published As

Publication number Publication date
AU2615288A (en) 1989-05-23

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