CA2301376C - Dispenser for use with a polyurethane mixing head - Google Patents
Dispenser for use with a polyurethane mixing head Download PDFInfo
- Publication number
- CA2301376C CA2301376C CA 2301376 CA2301376A CA2301376C CA 2301376 C CA2301376 C CA 2301376C CA 2301376 CA2301376 CA 2301376 CA 2301376 A CA2301376 A CA 2301376A CA 2301376 C CA2301376 C CA 2301376C
- Authority
- CA
- Canada
- Prior art keywords
- mixture
- strip
- cone
- mixing head
- outlet
- 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
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B3/00—Spraying or sprinkling apparatus with moving outlet elements or moving deflecting elements
- B05B3/02—Spraying or sprinkling apparatus with moving outlet elements or moving deflecting elements with rotating elements
- B05B3/10—Spraying or sprinkling apparatus with moving outlet elements or moving deflecting elements with rotating elements discharging over substantially the whole periphery of the rotating member, i.e. the spraying being effected by centrifugal forces
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B13/00—Machines or plants for applying liquids or other fluent materials to surfaces of objects or other work by spraying, not covered by groups B05B1/00 - B05B11/00
- B05B13/02—Means for supporting work; Arrangement or mounting of spray heads; Adaptation or arrangement of means for feeding work
- B05B13/04—Means for supporting work; Arrangement or mounting of spray heads; Adaptation or arrangement of means for feeding work the spray heads being moved during spraying operation
- B05B13/0463—Installation or apparatus for applying liquid or other fluent material to moving work of indefinite length
- B05B13/0468—Installation or apparatus for applying liquid or other fluent material to moving work of indefinite length with reciprocating or oscillating spray heads
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D1/00—Processes for applying liquids or other fluent materials
- B05D1/02—Processes for applying liquids or other fluent materials performed by spraying
-
- 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
- B05D2202/00—Metallic substrate
-
- 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
- B05D2252/00—Sheets
-
- 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
- B05D2503/00—Polyurethanes
Landscapes
- Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
Abstract
A spinning cone is positioned directly below a mixing head outlet to dispense and distribute a sticky mixture of polyurethane foam liquid chemical components. The mixing head and cone are reciprocated together across a longitudinally advancing metal strip to substantially uniformly distribute the mixture thereon. The procedure is practised in connection with the fabrication of overhead door insulated panels. In the prior art, plugging of dispensers would commonly occur within minutes, due to a build-up of adhering mixture on a surface followed by foaming. The spinning cone has dispensed satisfactorily for hours at a time.
Description
2 The present invention relates to an assembly and process for applying
3 a mixture of chemical components, for producing polyurethane foam, onto a
4 longitudinally advancing metal strip. The invention finds application in the production of foam-insulated panels used in overhead doors, insulated 6 building panels and insulating board.
9 It is conventional to produce foam-insulated panels as follows:
~ a pair of metal strips, one spaced directly above the other, are 11 advanced together;
12 ~ a mixingldispensing assembly is positioned between the strips. The 13 assembly comprises a polyurethane mixing head having an 14 attached dispenser, for admixing the polymerizable chemical components (organic resin and polyisocyanate) which react to 16 produce polyurethane foam and delivering the produced ,mixture 17 onto the lower strip;
18 ~ the mixingldispensing assembly is reciprocated transversely aaoss 19 the advancing lower strip to distribute the mixture thereacross; and ~ the strips then converge closer together and are advanced through 21 a long heating oven to cause the mixture to foam, fill the space 22 between the strips and solidify into insulating polyurethane foam 23 which is bonded to the two strips.
1 There are a number of commercially available mixing heads on the 2 market for mixing the chemical components. A typical example brings 3 separate streams of the two polyurethane foam-produdng components 4 through a pair of passageways formed in the mixing head and discharges them under pressure through opposed outlets into a mixing chamber and an 6 angularly positioned port leading to the dispenser. The components mix 7 turbulently as they meet and proceed together through the chamber and port.
8 There are also a number of commercially available dispensers, each of 9 which is mounted on a redprocating arm or carriage, for distributing the foam mixture produced by the mixing head onto the moving strip. For example, one 11 known dispenser is a tube, perforated along its length and dosed at its outer 12 end, which delivers the mixture in the form of a plurality of parallel streams of 13 small diameter. A second known dispenser is a hopper-like nozzle having a 14 bottom slot which delivers the mixture in the form of an elongate, thin curtain.
In connection with these assemblies it is desirable:
16 ~ that the components be well mixed;
17 ~ that the mixture be evenly distributed over the bottom strip; and 18 ~ that the assembly not plug readily , so that it can operate for several 19 hours without interruption.
However, in our experience these objectives have not been achieved 21 using the commercial mixingldispensing assemblies heretofore available. In 22 our testing with a variety of mixing heads and dispensers, of conventional 23 design and of our own design, we repeatedly experienced rapid plugging, 24 often within a few minutes. The chemical mixture is very sticky and tends to adhere to the metal surface of the mixing head port and to the internal 1 surfaces of the dispenser. The adhering material will foam up and plug one or 2 both of these devices. In addition, even distribution of the mixture was difficult 3 to sustain. For example, in the case of the perforated tube, some of the 4 perforations would begin to plug while others would remain open - as a result distribution would become uneven. There would be areas where less than the 6 optimum quantity of mixture would be deposited. These plugging and 7 distribution problems led to one or more of the following undesirable results:
8 ~ Void spaces being present in the cured insulation;
9 ~ Poor bonding of the cured insulation to the metal strips;
~ Costly shut-downs to deal with the plugging; and 11 ~ The production of a high proportion of poor quality or defective 12 panels, with corresponding losses and customer dissatisfaction.
In accordance with the present invention, a spinning cone, having a 16 downwardly sloped surface, is positioned in spaced relation directly beneath 17 the port outlet from the mixing head. The head and spinning cone are 18 reciprocated together across the advancing bottom strip to distribute the 19 chemical mixture along a zigzag path. Preferably the adjacent strips of laid-down mixture overlap along their margins.
21 It has been shown that the spinning cone is not susceptible to plugging.
22 In addition it appears to contribute to improved mixing of the chemical 23 components.
1 In a preferred feature, the cylindrical surface of the port of the mixing 2 head is coated with a non,adhering material such as Teflont'°. As a result of 3 this change, plugging of the port has been reduced. It has also been found 4 useful to coat the top surface of the cone with Teflon or the like - the build-up of foam thereon is thereby reduced.
6 By combining these features, test runs of 5 - 8 hours duration have 7 been achieved without plugging. In addition, improved mixing of the mixture 8 components and uniformity of distribution of the mixture has been achieved, 9 thereby reducing the incidence of void spaces and improving bonding of the foam to the metal skin.
11 Broadly stated, in one aspect the invention comprises a method of 12 applying a liquid mixture of polyurethane foam components onto the top 13 surface of a metal strip being advanced longitudinally, comprising:
delivering 14 a stream of the mixture from a mixing head having an outlet onto the apex of a spinning cone positioned directly beneath the outlet and above the strip, to 16 dispense the mixture onto the strip; and reciprocating the mixing head and 17 cone together transversely aaoss the longitudinally advancing strip to evenly 18 distribute the dispensed mixture across the top surface of the strip.
19 In another aspect, the invention comprises a reciprocating mixingldispensing assembly for delivering a mixture of polyurethane foam 21 components onto a longitudinally advancing strip, comprising: a mixing head 22 for mixing the components and producing a mixture thereof through an outlet;
23 a cone, having an apex positioned centrally beneath the outlet; means for 24 spinning the cone to dispense the mixture onto the strip; and means for
9 It is conventional to produce foam-insulated panels as follows:
~ a pair of metal strips, one spaced directly above the other, are 11 advanced together;
12 ~ a mixingldispensing assembly is positioned between the strips. The 13 assembly comprises a polyurethane mixing head having an 14 attached dispenser, for admixing the polymerizable chemical components (organic resin and polyisocyanate) which react to 16 produce polyurethane foam and delivering the produced ,mixture 17 onto the lower strip;
18 ~ the mixingldispensing assembly is reciprocated transversely aaoss 19 the advancing lower strip to distribute the mixture thereacross; and ~ the strips then converge closer together and are advanced through 21 a long heating oven to cause the mixture to foam, fill the space 22 between the strips and solidify into insulating polyurethane foam 23 which is bonded to the two strips.
1 There are a number of commercially available mixing heads on the 2 market for mixing the chemical components. A typical example brings 3 separate streams of the two polyurethane foam-produdng components 4 through a pair of passageways formed in the mixing head and discharges them under pressure through opposed outlets into a mixing chamber and an 6 angularly positioned port leading to the dispenser. The components mix 7 turbulently as they meet and proceed together through the chamber and port.
8 There are also a number of commercially available dispensers, each of 9 which is mounted on a redprocating arm or carriage, for distributing the foam mixture produced by the mixing head onto the moving strip. For example, one 11 known dispenser is a tube, perforated along its length and dosed at its outer 12 end, which delivers the mixture in the form of a plurality of parallel streams of 13 small diameter. A second known dispenser is a hopper-like nozzle having a 14 bottom slot which delivers the mixture in the form of an elongate, thin curtain.
In connection with these assemblies it is desirable:
16 ~ that the components be well mixed;
17 ~ that the mixture be evenly distributed over the bottom strip; and 18 ~ that the assembly not plug readily , so that it can operate for several 19 hours without interruption.
However, in our experience these objectives have not been achieved 21 using the commercial mixingldispensing assemblies heretofore available. In 22 our testing with a variety of mixing heads and dispensers, of conventional 23 design and of our own design, we repeatedly experienced rapid plugging, 24 often within a few minutes. The chemical mixture is very sticky and tends to adhere to the metal surface of the mixing head port and to the internal 1 surfaces of the dispenser. The adhering material will foam up and plug one or 2 both of these devices. In addition, even distribution of the mixture was difficult 3 to sustain. For example, in the case of the perforated tube, some of the 4 perforations would begin to plug while others would remain open - as a result distribution would become uneven. There would be areas where less than the 6 optimum quantity of mixture would be deposited. These plugging and 7 distribution problems led to one or more of the following undesirable results:
8 ~ Void spaces being present in the cured insulation;
9 ~ Poor bonding of the cured insulation to the metal strips;
~ Costly shut-downs to deal with the plugging; and 11 ~ The production of a high proportion of poor quality or defective 12 panels, with corresponding losses and customer dissatisfaction.
In accordance with the present invention, a spinning cone, having a 16 downwardly sloped surface, is positioned in spaced relation directly beneath 17 the port outlet from the mixing head. The head and spinning cone are 18 reciprocated together across the advancing bottom strip to distribute the 19 chemical mixture along a zigzag path. Preferably the adjacent strips of laid-down mixture overlap along their margins.
21 It has been shown that the spinning cone is not susceptible to plugging.
22 In addition it appears to contribute to improved mixing of the chemical 23 components.
1 In a preferred feature, the cylindrical surface of the port of the mixing 2 head is coated with a non,adhering material such as Teflont'°. As a result of 3 this change, plugging of the port has been reduced. It has also been found 4 useful to coat the top surface of the cone with Teflon or the like - the build-up of foam thereon is thereby reduced.
6 By combining these features, test runs of 5 - 8 hours duration have 7 been achieved without plugging. In addition, improved mixing of the mixture 8 components and uniformity of distribution of the mixture has been achieved, 9 thereby reducing the incidence of void spaces and improving bonding of the foam to the metal skin.
11 Broadly stated, in one aspect the invention comprises a method of 12 applying a liquid mixture of polyurethane foam components onto the top 13 surface of a metal strip being advanced longitudinally, comprising:
delivering 14 a stream of the mixture from a mixing head having an outlet onto the apex of a spinning cone positioned directly beneath the outlet and above the strip, to 16 dispense the mixture onto the strip; and reciprocating the mixing head and 17 cone together transversely aaoss the longitudinally advancing strip to evenly 18 distribute the dispensed mixture across the top surface of the strip.
19 In another aspect, the invention comprises a reciprocating mixingldispensing assembly for delivering a mixture of polyurethane foam 21 components onto a longitudinally advancing strip, comprising: a mixing head 22 for mixing the components and producing a mixture thereof through an outlet;
23 a cone, having an apex positioned centrally beneath the outlet; means for 24 spinning the cone to dispense the mixture onto the strip; and means for
5 1 reciprocating the mixing head and cone together across the strip to distribute 2 the dispensed mixture thereon.
Figure 1 is a schematic side view showing the mixing dispensing
Figure 1 is a schematic side view showing the mixing dispensing
6 assembly positioned between converging, longitudinally advancing metal
7 strips, arranged for the production of insulated panels;
8 Figure 2 is a perspective view of the assembly distributing chemical
9 mixture onto the lower strip;
Figure 3 is a partly sectional side view of the mixing head, dispenser 11 and drive means; and 12 Figure 4 is a fanciful plan view of the overlapping strips of chemical 13 mixture laid down by the assembly.
DESCRIPTION OF THE PREFERRED EMBODIMENT
16 As shown in Figures 1, 2 and 4, a mixingldispensing assembly 1 is 17 mounted on a conventional reciprocating arm 2. The assembly 1 is positioned 18 between top and bottom metal strips 3,4. The strips 3,4 are advanced 19 longitudinally while the assembly 1 is reciprocated back and forth. The assembly 1 includes a polyurethane mixing head 5 and a dispenser 6. The 21 dispenser 6 comprises a spinning cone 7 positioned centrally beneath the 22 outlet 8 of the mixing head 5. The mixing head 5 is operative to produce a 23 pressurized stream 9 of a mixture of chemical components which produce 24 polyurethane foam when cured by heat. The spinning cone 7 is operative to 1 dispense the mixture 10 in the form of a band 11 following a zig-zag path 12 2 back and forth across the top surface 13 of the bottom strip 4.
3 The mixing head 5 is conventional. It has separate passageways 14, 4 15 connected to hoses 16, 17 for the supply of chemical component streams 18, 19 of resin and polyisocyanate respectively. The passageways 14, 15 6 discharge the streams 18, 19 through opposed orifices 20, 21 into a mixing 7 chamber 22. The mixing chamber 22 connects with a port 23 formed by a 8 perpendicularly oriented tubular port member 24. The inner surface 25 of the 9 port member 24 is coated with a layer 26 of Teflon. The port member 24 is screw-threaded into the mixing head body 5a.
11 The mixing head 5 is mounted by a bracket 27 and screws 28 to the 12 reciprocating arm 2.
13 The dispenser 6 comprises a cone 7 and means 40 for spinning the 14 cone. The spinning means 40 comprises a motor 29 mounted to the arm 2 by bracket 30 and screws 31. A bearing assembly 32 is secured to the end of 16 the port member 24. A pulley 33 is rotatably mounted on the bearing 17 assembly 32. A drive belt 34 connects the motor output shaft sheave 35 with 18 the pulley 33. A plurality of holder wires 36 are connected with the sheave 19 and support the cone 7. As shown, the apex 37 of the cone 7 is positioned directly below and close to the outlet 8 of the mixer head port 23. The cone 21 apex 37 is aligned with the axis of 'the port 23. The surface 42 of the cone 7 is 22 coated with Teflon' .
' Trade Mark 1 In operation, the arm 2 is reciprocated to move the mixing/dispensing 2 assembly 1 back and forth across the advancing bottom strip 4. The means 3 40 rotate or spin the cone 7. The mixture stream 9 issuing under pressure 4 from the port outlet 8 strikes the downwardly sloped, spinning top surface of the cone 7 and is dispersed and thrown outwardly to deposit as a band 11 6 on the surface 13 of the bottom strip 4. The band 11 follows a zig-zag path 7 across the strip. The rate of advance of the strip and rate of reciprocation of 8 the mixing/dispensing assembly are co-ordinated so that the bands 11 overlap 9 slightly along their side edges.
(ET054144.DOC;1 }8
Figure 3 is a partly sectional side view of the mixing head, dispenser 11 and drive means; and 12 Figure 4 is a fanciful plan view of the overlapping strips of chemical 13 mixture laid down by the assembly.
DESCRIPTION OF THE PREFERRED EMBODIMENT
16 As shown in Figures 1, 2 and 4, a mixingldispensing assembly 1 is 17 mounted on a conventional reciprocating arm 2. The assembly 1 is positioned 18 between top and bottom metal strips 3,4. The strips 3,4 are advanced 19 longitudinally while the assembly 1 is reciprocated back and forth. The assembly 1 includes a polyurethane mixing head 5 and a dispenser 6. The 21 dispenser 6 comprises a spinning cone 7 positioned centrally beneath the 22 outlet 8 of the mixing head 5. The mixing head 5 is operative to produce a 23 pressurized stream 9 of a mixture of chemical components which produce 24 polyurethane foam when cured by heat. The spinning cone 7 is operative to 1 dispense the mixture 10 in the form of a band 11 following a zig-zag path 12 2 back and forth across the top surface 13 of the bottom strip 4.
3 The mixing head 5 is conventional. It has separate passageways 14, 4 15 connected to hoses 16, 17 for the supply of chemical component streams 18, 19 of resin and polyisocyanate respectively. The passageways 14, 15 6 discharge the streams 18, 19 through opposed orifices 20, 21 into a mixing 7 chamber 22. The mixing chamber 22 connects with a port 23 formed by a 8 perpendicularly oriented tubular port member 24. The inner surface 25 of the 9 port member 24 is coated with a layer 26 of Teflon. The port member 24 is screw-threaded into the mixing head body 5a.
11 The mixing head 5 is mounted by a bracket 27 and screws 28 to the 12 reciprocating arm 2.
13 The dispenser 6 comprises a cone 7 and means 40 for spinning the 14 cone. The spinning means 40 comprises a motor 29 mounted to the arm 2 by bracket 30 and screws 31. A bearing assembly 32 is secured to the end of 16 the port member 24. A pulley 33 is rotatably mounted on the bearing 17 assembly 32. A drive belt 34 connects the motor output shaft sheave 35 with 18 the pulley 33. A plurality of holder wires 36 are connected with the sheave 19 and support the cone 7. As shown, the apex 37 of the cone 7 is positioned directly below and close to the outlet 8 of the mixer head port 23. The cone 21 apex 37 is aligned with the axis of 'the port 23. The surface 42 of the cone 7 is 22 coated with Teflon' .
' Trade Mark 1 In operation, the arm 2 is reciprocated to move the mixing/dispensing 2 assembly 1 back and forth across the advancing bottom strip 4. The means 3 40 rotate or spin the cone 7. The mixture stream 9 issuing under pressure 4 from the port outlet 8 strikes the downwardly sloped, spinning top surface of the cone 7 and is dispersed and thrown outwardly to deposit as a band 11 6 on the surface 13 of the bottom strip 4. The band 11 follows a zig-zag path 7 across the strip. The rate of advance of the strip and rate of reciprocation of 8 the mixing/dispensing assembly are co-ordinated so that the bands 11 overlap 9 slightly along their side edges.
(ET054144.DOC;1 }8
Claims (3)
EXCLUSIVE PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS
FOLLOWS:
1. A method of applying a liquid mixture of polyurethane foam components onto a top surface of a metal strip being advanced longitudinally, comprising:
delivering a stream of the mixture from a mixing head having an outlet onto the apex of a spinning cone positioned directly beneath the outlet and above the strip, to dispense the mixture onto the strip; and reciprocating the mixing head and cone together transversely across the longitudinally advancing strip to evenly distribute the dispensed mixture across the top surface of the strip.
delivering a stream of the mixture from a mixing head having an outlet onto the apex of a spinning cone positioned directly beneath the outlet and above the strip, to dispense the mixture onto the strip; and reciprocating the mixing head and cone together transversely across the longitudinally advancing strip to evenly distribute the dispensed mixture across the top surface of the strip.
2. The method as set forth in claim 1 wherein:
the mixture is dispensed as bands having side edges and extending across the top surface of the strip and the bands overlap along their side edges.
the mixture is dispensed as bands having side edges and extending across the top surface of the strip and the bands overlap along their side edges.
3. A reciprocating mixing/dispensing assembly for delivering a mixture of polyurethane foam components onto a longitudinally advancing strip, comprising:
a mixing head, having an outlet, for mixing the components and producing a mixture thereof through an outlet;
a cone, having an apex positioned centrally beneath the outlet;
means for spinning the cone to dispense the mixture onto the strip; and means for reciprocating the mixing head and cone together across the strip to distribute the dispensed mixture thereon.
a mixing head, having an outlet, for mixing the components and producing a mixture thereof through an outlet;
a cone, having an apex positioned centrally beneath the outlet;
means for spinning the cone to dispense the mixture onto the strip; and means for reciprocating the mixing head and cone together across the strip to distribute the dispensed mixture thereon.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2301376 CA2301376C (en) | 2000-03-20 | 2000-03-20 | Dispenser for use with a polyurethane mixing head |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2301376 CA2301376C (en) | 2000-03-20 | 2000-03-20 | Dispenser for use with a polyurethane mixing head |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2301376A1 CA2301376A1 (en) | 2001-09-20 |
| CA2301376C true CA2301376C (en) | 2003-06-03 |
Family
ID=4165566
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2301376 Expired - Lifetime CA2301376C (en) | 2000-03-20 | 2000-03-20 | Dispenser for use with a polyurethane mixing head |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2301376C (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113751247A (en) * | 2021-09-10 | 2021-12-07 | 江苏润华膜业科技有限公司 | Waterborne epoxy spraying equipment convenient to fixed work piece |
-
2000
- 2000-03-20 CA CA 2301376 patent/CA2301376C/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| CA2301376A1 (en) | 2001-09-20 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| MKEX | Expiry |
Effective date: 20200320 |