CA1243482A - Coating device for material webs - Google Patents
Coating device for material websInfo
- Publication number
- CA1243482A CA1243482A CA000482999A CA482999A CA1243482A CA 1243482 A CA1243482 A CA 1243482A CA 000482999 A CA000482999 A CA 000482999A CA 482999 A CA482999 A CA 482999A CA 1243482 A CA1243482 A CA 1243482A
- Authority
- CA
- Canada
- Prior art keywords
- gears
- housing
- pump
- slot
- nozzle
- 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
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- Coating Apparatus (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
A device for the application of a thin layer of a coat-ing material onto a material web passing across a backing roller comprises a slot nozzle arrangement having a nozzle slot. In order to ensure uniform and sufficient delivery of coating material across the length of the nozzle slot, the coating material is del-ivered from a supply container through a delivery channel extending across the coating width to the nozzle slot of the slot nozzle arrangement and in the delivery channel of the slot nozzle arrange-ment a gear pump arrangement is provided which has a plurality of rectilinearly aligned pump sections, each having two intermeshed pump gears, the arrangement extending over the coating width and arranged with the distance pieces mounting the pump gears between the pump sections to be easily removable. The distance pieces are formed as carbon bearings and the parts are channeled for heating and cooling.
A device for the application of a thin layer of a coat-ing material onto a material web passing across a backing roller comprises a slot nozzle arrangement having a nozzle slot. In order to ensure uniform and sufficient delivery of coating material across the length of the nozzle slot, the coating material is del-ivered from a supply container through a delivery channel extending across the coating width to the nozzle slot of the slot nozzle arrangement and in the delivery channel of the slot nozzle arrange-ment a gear pump arrangement is provided which has a plurality of rectilinearly aligned pump sections, each having two intermeshed pump gears, the arrangement extending over the coating width and arranged with the distance pieces mounting the pump gears between the pump sections to be easily removable. The distance pieces are formed as carbon bearings and the parts are channeled for heating and cooling.
Description
~I.Z~3~
This application corresponds to my patent application P34 06 099.5-27 ~iled February 20, 198~ in the Federal Republic of Germany.
BACKGROUND OF THE INVENTION
I am aware that gear pumps, separate from the extrusion die of an extrusion apparatus, have been heretofore used to supply coating to a coating nozzle.
It has also been proposed, as in U.S. Patent 3,162,886 to Wise of December 29, 1964, to provide a pair of outlet nozzles leading from a hopper containing mortar, each nozzle having an elongated helical feed auger therewithin for delivering mortar to each opposite side of cement block structures.
In U.S. Patent 3,333,567 to Rich, et al, of August 1, 1967 a butter extruder is disclosed in which a thin sheet of butter is extruded from a nozzle with the assistance of a single, elong-ated gear pump, full length of the nozzle and a manifold housing full of packed butter under pressure.
However, as far as I am aware the prior art has not dis-closed an elongated, narrow, extrusion slot nozzle for extruding a thin, layer of uniform thickness onto a moving web of material, the nozzle having a built-in gear pump formed in a rectilinearly, axially, aligned, set of separate intermeshed pairs of gears, spaced apart preferably by carbon bearings, all parts removable for cleaning and channeled for heating or cooling.
_UMMARY OF THE INVENTION
The invention relates to a device for applying a thin coating of coating materlal onto a material web passing across a backing roller and comprising a slot nozzle arrangement having a _. .
124l341~2 nozzle slot. Such a device is known for example from DE-PS
31 00 101, or United States Patent 3,556,832 of January 19, 1971 to George Park.
In such coating devices the main point is that the coat-ing material is applied across large breadths of many meters and evenly across the breadth and accordingly even and sufficient delivery of coating material must be ensured along the nozzle slot.
The invention is based on the object of creating a coat-ing device of the above described type with which sufficient and satisfactory delivery of coating material to the nozzle slot is ensured which is uniform over the entire desired coating device width. In addition, both simple adaption of the coating device to differing coating widths and also rapid and simple cleaning of the slot nozzle arrangement when converting to different coating mat-erials should be ensured.
The invention provides a slot nozzle arrangement for applying a thin coating of a coating material onto a web, compris-ing: a housing; a supply passageway in the housing; a plurality of pairs of meshed gears in the housing, the supply passageway leading through the housing to the engagement of the pairs of meshed gears, at least one of each pair being driven and in turn, driving the other of the pair to provide pump gears, the said driven gears being aligned coaxially, an axle between and connected coaxially to each said adjacent driven gears in a form locking manner; a spacer in the housing between each adjacent two said driven gears, each of said spacers serving also as a bearing to mount an axle; a delivery passageway in the housing; a slot nozzle extending the width of the coating to be applied and to which lZ~3~8Z
nozzle the delivery passageway leads from the gear intersections;
the housing being separable along a central plane on which the central surfaces of the passageways and the line of engagement of the gears lie; and said housing being pivotally connected to open along said central plane to service and clean: the spacers individu-ally, the axles individually, the gearings individually, the pass-ageways and the nozzle.
The invention also provides a device for applying a thin coating of a coating r~aterial onto a web moving over a backing roller comprising: an extrusion die with an elongated narrow nozzle extending the full width of the web; a delivery channel for delivering coating material to the die; a container for the mater-ial having an outlet; a plurality of axially aligned, separate, spaced apart gear pumps in the delivery channel for the die inter-posed between the container and the die, each pump comprising a pair of intermeshed gears, at least one of each pair being a driven gear, and the driven gears be1ng axially aligned and drivingly connected, each driven gear driving the other gear of the pair; a plurality of elongated bearings, each pump being spaced apart from the adjacent pump by said bearings; the die being formed of housing members that are pivotally connected to separate about a central longitudinal plane, including the line of engage-ment of the gears, thereby to open for cleaning of the die.
Such an arrangement allows a sufficient amount of coat-ing material divided uniformly across the coating breadth to be available at the nozzle slot, the number of pump sections being selected according to the desired coating width and being modifi-able in an easy manner.
12~34~32 The axial length of the pump gears is expediently approx-imately twice the axial length of the spacers or distance pieces.
By this means r completely uniform distribution of the coating material along the nozzle slot is achleved. The spacers or distance pieces are expediently constructed as carbon bearings.
In current and usual coating processes, the pump gears are advantageously driven at approximately 10 to 12 rpm.
Furthermore, with the slot nozzle arrangement according to the invention it can be advantageous to provide in the region of the delivery channel and of the gear pump arrangement heating or cooling channels ext~ndiny acro~s the coating width which ensure : ' .~
.,a ~ -3a--"` lZ~3~Z
good heat transfer within the slot nozzle arrangement.
The walls of the supply container are expediently heated, particularly for the processing of hot melt coatings.
Furthermore, it is advantayeous to arrange between the gear pump arrangement and the nozzle lips of the slot nozzle arrangement a rod-like circular gate valve for closing the delivery channel, the closure rod of the circular gate valve being mounted expediently beneath the delivery channel in the vicinity of the nozzle lips. By this means there results not only an extremely improved convenience of conversion and cleaning of the slot nozzle arrangement, but also the possibility of improved error-free coat-ing of the material web.
The invention is explained in more detail in the follow-ing with reference to an exemplary embodiment illustrated in the drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
Fig. 1 shows a lateral sectional view of the nozzle slot arrangement and coating device according to the invention; and Fig. 2 shows a longitudinal sectional view along the line II-II through the pump arrangement of the slot nozzle arrange-ment in Fig. 1.
DESCRIPTION OF THE PREFERRED EMBODIMENT
.
Figures 1 and 2 illustrate a preferred embodiment of a device according to the invention for the application of a thin coating of a coating material and has a backing rolier 1, which has a surface layer of normal or hard rubber. A material web 2 to be coated is guided across the backing roller 1 in the direction of the arrow A.
:.
1~4~82 On one side of the backing roller 1, is provided a slot nozzle arrangement 3 having a fixed lead-on nozzle lip and a lead-off nozzle lip of the nozzle slot 4. The lead-on nozzle lip 5 of the nozzle slot 4, is fixed, and the lead-off nozzle lip 6 of the nozzle slot 4 is constructed as a rotatable doctor member 6.
Material webs to be coated are for example, paper webs, synthetic foils, metal foils, fabric webs and combinations of such material webs. Thus, the material web can be an aluminum foil of 0.008 mm, 0.012 mm. 0.02 mm and up to 0.12 mm thickness. A paper web may be flat, rubbed or creped papers of 40 to 120 g/m2, syn-thetic foils may be polyethylene foils of 40 to 120 mm thickness, biaxial spun so-called oriented polypropylene foil of 30 to 120 um thickness and polyester foils in the same thickness range. Furth-ermore, hard PVC foils and monomer or polymer plastici~ed PVC foils can be processed and fabric webs may include for example carpet laying strips and binding materials.
Coating materials may for example, include paraffins and microcrystalline waxes having processing temperatures between 75C
and 100C with application amounts between 4 and 40 g/m . Further-more, coating hot melts consisting of ethylevinylacetate copolymers,mixed with paraffin and resins may be employed at processing temp-eratures between 140C and 190C for the upper surface treatment of backing materials. Melted adhesives used have processing temper-atures between 140C and 190C when using amounts between 12 and 40 g/m2, whilst thermoset adhesives are processed at temperatures of 70C to 80C and application amounts from 40 g/m2. Poly-urethane adhesives consisting of two components are mixed shortly before coating.
. .
12~3~82 Further coating materials are aqueous emulsions and dispersions to Eorm a PVDC coating at room temperature. Acrylate adhesives as aqueous dispersions with coating likewise at room temperature, various strong adhesives which are processed at temp-eratures of 70C to 90C, binding materials and coating masses which are dissolved in organic solvents and are processed at room temperature and finally cold setting PVC adhesive on the basis of polyvinyl alcohol may be employed.
Coating material 7 is located in a supply container, or hopper 8, which can be heated by heating tubes 9. By way of a delivery channel 10 passing over the largest coating width, the coating material 7 is delivered by gravity feed to a gear pump arrangement 12, also extending across the coating width and from there is pumped by the gear pump arrangement 12, through a further delivery channel 11 of the nozzle slot 4, which extends across the largest coating width.
The gear pump arrangement 12, has a plurality of rectilin-early aligned, spaced apart, pump sections 13, each having a driven pump gear 14 and a co-running intermeshed pump gear 15. setween the pump sections 13 are arranged distance pieces, or spacers 16, which moun~ the pump gears 13, 14. Both the pump sections 13 and also the distance pieces 16, are arranged in the slot nozzle arrangement 3, to be easily removable for conversion and cleaning of khe slot nozzle arrangement. Adaption to various coating wid-ths can be achieved by insertion of a corresponding number of pump sections 13 and distance pieces 16, in the slot nozzle arrangement.
The pump gears 14, and 15 are mounted in the distance pieces 16 by means of axle ends 17 on both sides. Furthermore, ~Z~3~2 the driven pump gears 14 are connected together in driving connect-ion in the vicinity of the distance pieces 16 by means of axial connecting pieces 18 which engage in the pump gears 1~ in a Eorm locking manner, drive o all pump sections 13 being thus possible in common from the side 19 of the gear pump arrangement 12, at a speed of approximately 10 to 20 rpm. The distance pieces 16 are preferably constructed as carbon bearings.
The slo-t nozzle arrangement 3, is pivotally constructed in respect of a plane extending through the central longitudinal plane 20, between the pump gears 14, and 15, whereby conversion and cleaning of the slot nozzle arrangement 3, can be carried out in a particularly simple and convenient manner.
The axial length of the pump gears 14, and 15 amounts advantageously to approximately twice the axial length of the dist ance pieces 16, wheraby in each case a uniform distribution of the coating material 7 is ensured along the length of the nozzle slot 4.
In the region of the delivery channel 10, 11 and the gear pump arrangement 12 expediently heating or cooling channels 21 c~n be provided extending.across the coating width in order to ensure good heai transfer.
Between the gear pump arrangement 12, and the nozzle lips 5 and 6, is arranged beneath the delivery channel 11 in the vicinity of the nozzle lips 5 and 6, a closure rod 22, of a rod-like circular gate valve for closing the delivery channel 11. This circular gate valve is not only advantageous in respect of convers-ion and cleaning of the slot nozzle arrangement 3, but also ensures that with the described slot nozzle arrangement problem-free coat-ing can be achieved.
This application corresponds to my patent application P34 06 099.5-27 ~iled February 20, 198~ in the Federal Republic of Germany.
BACKGROUND OF THE INVENTION
I am aware that gear pumps, separate from the extrusion die of an extrusion apparatus, have been heretofore used to supply coating to a coating nozzle.
It has also been proposed, as in U.S. Patent 3,162,886 to Wise of December 29, 1964, to provide a pair of outlet nozzles leading from a hopper containing mortar, each nozzle having an elongated helical feed auger therewithin for delivering mortar to each opposite side of cement block structures.
In U.S. Patent 3,333,567 to Rich, et al, of August 1, 1967 a butter extruder is disclosed in which a thin sheet of butter is extruded from a nozzle with the assistance of a single, elong-ated gear pump, full length of the nozzle and a manifold housing full of packed butter under pressure.
However, as far as I am aware the prior art has not dis-closed an elongated, narrow, extrusion slot nozzle for extruding a thin, layer of uniform thickness onto a moving web of material, the nozzle having a built-in gear pump formed in a rectilinearly, axially, aligned, set of separate intermeshed pairs of gears, spaced apart preferably by carbon bearings, all parts removable for cleaning and channeled for heating or cooling.
_UMMARY OF THE INVENTION
The invention relates to a device for applying a thin coating of coating materlal onto a material web passing across a backing roller and comprising a slot nozzle arrangement having a _. .
124l341~2 nozzle slot. Such a device is known for example from DE-PS
31 00 101, or United States Patent 3,556,832 of January 19, 1971 to George Park.
In such coating devices the main point is that the coat-ing material is applied across large breadths of many meters and evenly across the breadth and accordingly even and sufficient delivery of coating material must be ensured along the nozzle slot.
The invention is based on the object of creating a coat-ing device of the above described type with which sufficient and satisfactory delivery of coating material to the nozzle slot is ensured which is uniform over the entire desired coating device width. In addition, both simple adaption of the coating device to differing coating widths and also rapid and simple cleaning of the slot nozzle arrangement when converting to different coating mat-erials should be ensured.
The invention provides a slot nozzle arrangement for applying a thin coating of a coating material onto a web, compris-ing: a housing; a supply passageway in the housing; a plurality of pairs of meshed gears in the housing, the supply passageway leading through the housing to the engagement of the pairs of meshed gears, at least one of each pair being driven and in turn, driving the other of the pair to provide pump gears, the said driven gears being aligned coaxially, an axle between and connected coaxially to each said adjacent driven gears in a form locking manner; a spacer in the housing between each adjacent two said driven gears, each of said spacers serving also as a bearing to mount an axle; a delivery passageway in the housing; a slot nozzle extending the width of the coating to be applied and to which lZ~3~8Z
nozzle the delivery passageway leads from the gear intersections;
the housing being separable along a central plane on which the central surfaces of the passageways and the line of engagement of the gears lie; and said housing being pivotally connected to open along said central plane to service and clean: the spacers individu-ally, the axles individually, the gearings individually, the pass-ageways and the nozzle.
The invention also provides a device for applying a thin coating of a coating r~aterial onto a web moving over a backing roller comprising: an extrusion die with an elongated narrow nozzle extending the full width of the web; a delivery channel for delivering coating material to the die; a container for the mater-ial having an outlet; a plurality of axially aligned, separate, spaced apart gear pumps in the delivery channel for the die inter-posed between the container and the die, each pump comprising a pair of intermeshed gears, at least one of each pair being a driven gear, and the driven gears be1ng axially aligned and drivingly connected, each driven gear driving the other gear of the pair; a plurality of elongated bearings, each pump being spaced apart from the adjacent pump by said bearings; the die being formed of housing members that are pivotally connected to separate about a central longitudinal plane, including the line of engage-ment of the gears, thereby to open for cleaning of the die.
Such an arrangement allows a sufficient amount of coat-ing material divided uniformly across the coating breadth to be available at the nozzle slot, the number of pump sections being selected according to the desired coating width and being modifi-able in an easy manner.
12~34~32 The axial length of the pump gears is expediently approx-imately twice the axial length of the spacers or distance pieces.
By this means r completely uniform distribution of the coating material along the nozzle slot is achleved. The spacers or distance pieces are expediently constructed as carbon bearings.
In current and usual coating processes, the pump gears are advantageously driven at approximately 10 to 12 rpm.
Furthermore, with the slot nozzle arrangement according to the invention it can be advantageous to provide in the region of the delivery channel and of the gear pump arrangement heating or cooling channels ext~ndiny acro~s the coating width which ensure : ' .~
.,a ~ -3a--"` lZ~3~Z
good heat transfer within the slot nozzle arrangement.
The walls of the supply container are expediently heated, particularly for the processing of hot melt coatings.
Furthermore, it is advantayeous to arrange between the gear pump arrangement and the nozzle lips of the slot nozzle arrangement a rod-like circular gate valve for closing the delivery channel, the closure rod of the circular gate valve being mounted expediently beneath the delivery channel in the vicinity of the nozzle lips. By this means there results not only an extremely improved convenience of conversion and cleaning of the slot nozzle arrangement, but also the possibility of improved error-free coat-ing of the material web.
The invention is explained in more detail in the follow-ing with reference to an exemplary embodiment illustrated in the drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
Fig. 1 shows a lateral sectional view of the nozzle slot arrangement and coating device according to the invention; and Fig. 2 shows a longitudinal sectional view along the line II-II through the pump arrangement of the slot nozzle arrange-ment in Fig. 1.
DESCRIPTION OF THE PREFERRED EMBODIMENT
.
Figures 1 and 2 illustrate a preferred embodiment of a device according to the invention for the application of a thin coating of a coating material and has a backing rolier 1, which has a surface layer of normal or hard rubber. A material web 2 to be coated is guided across the backing roller 1 in the direction of the arrow A.
:.
1~4~82 On one side of the backing roller 1, is provided a slot nozzle arrangement 3 having a fixed lead-on nozzle lip and a lead-off nozzle lip of the nozzle slot 4. The lead-on nozzle lip 5 of the nozzle slot 4, is fixed, and the lead-off nozzle lip 6 of the nozzle slot 4 is constructed as a rotatable doctor member 6.
Material webs to be coated are for example, paper webs, synthetic foils, metal foils, fabric webs and combinations of such material webs. Thus, the material web can be an aluminum foil of 0.008 mm, 0.012 mm. 0.02 mm and up to 0.12 mm thickness. A paper web may be flat, rubbed or creped papers of 40 to 120 g/m2, syn-thetic foils may be polyethylene foils of 40 to 120 mm thickness, biaxial spun so-called oriented polypropylene foil of 30 to 120 um thickness and polyester foils in the same thickness range. Furth-ermore, hard PVC foils and monomer or polymer plastici~ed PVC foils can be processed and fabric webs may include for example carpet laying strips and binding materials.
Coating materials may for example, include paraffins and microcrystalline waxes having processing temperatures between 75C
and 100C with application amounts between 4 and 40 g/m . Further-more, coating hot melts consisting of ethylevinylacetate copolymers,mixed with paraffin and resins may be employed at processing temp-eratures between 140C and 190C for the upper surface treatment of backing materials. Melted adhesives used have processing temper-atures between 140C and 190C when using amounts between 12 and 40 g/m2, whilst thermoset adhesives are processed at temperatures of 70C to 80C and application amounts from 40 g/m2. Poly-urethane adhesives consisting of two components are mixed shortly before coating.
. .
12~3~82 Further coating materials are aqueous emulsions and dispersions to Eorm a PVDC coating at room temperature. Acrylate adhesives as aqueous dispersions with coating likewise at room temperature, various strong adhesives which are processed at temp-eratures of 70C to 90C, binding materials and coating masses which are dissolved in organic solvents and are processed at room temperature and finally cold setting PVC adhesive on the basis of polyvinyl alcohol may be employed.
Coating material 7 is located in a supply container, or hopper 8, which can be heated by heating tubes 9. By way of a delivery channel 10 passing over the largest coating width, the coating material 7 is delivered by gravity feed to a gear pump arrangement 12, also extending across the coating width and from there is pumped by the gear pump arrangement 12, through a further delivery channel 11 of the nozzle slot 4, which extends across the largest coating width.
The gear pump arrangement 12, has a plurality of rectilin-early aligned, spaced apart, pump sections 13, each having a driven pump gear 14 and a co-running intermeshed pump gear 15. setween the pump sections 13 are arranged distance pieces, or spacers 16, which moun~ the pump gears 13, 14. Both the pump sections 13 and also the distance pieces 16, are arranged in the slot nozzle arrangement 3, to be easily removable for conversion and cleaning of khe slot nozzle arrangement. Adaption to various coating wid-ths can be achieved by insertion of a corresponding number of pump sections 13 and distance pieces 16, in the slot nozzle arrangement.
The pump gears 14, and 15 are mounted in the distance pieces 16 by means of axle ends 17 on both sides. Furthermore, ~Z~3~2 the driven pump gears 14 are connected together in driving connect-ion in the vicinity of the distance pieces 16 by means of axial connecting pieces 18 which engage in the pump gears 1~ in a Eorm locking manner, drive o all pump sections 13 being thus possible in common from the side 19 of the gear pump arrangement 12, at a speed of approximately 10 to 20 rpm. The distance pieces 16 are preferably constructed as carbon bearings.
The slo-t nozzle arrangement 3, is pivotally constructed in respect of a plane extending through the central longitudinal plane 20, between the pump gears 14, and 15, whereby conversion and cleaning of the slot nozzle arrangement 3, can be carried out in a particularly simple and convenient manner.
The axial length of the pump gears 14, and 15 amounts advantageously to approximately twice the axial length of the dist ance pieces 16, wheraby in each case a uniform distribution of the coating material 7 is ensured along the length of the nozzle slot 4.
In the region of the delivery channel 10, 11 and the gear pump arrangement 12 expediently heating or cooling channels 21 c~n be provided extending.across the coating width in order to ensure good heai transfer.
Between the gear pump arrangement 12, and the nozzle lips 5 and 6, is arranged beneath the delivery channel 11 in the vicinity of the nozzle lips 5 and 6, a closure rod 22, of a rod-like circular gate valve for closing the delivery channel 11. This circular gate valve is not only advantageous in respect of convers-ion and cleaning of the slot nozzle arrangement 3, but also ensures that with the described slot nozzle arrangement problem-free coat-ing can be achieved.
Claims (10)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A slot nozzle arrangement for applying a thin coating of a coating material onto a web, comprising:
a housing;
a supply passageway in the housing;
a plurality of pairs of meshed gears in the housing, the supply passageway leading through the housing to the engage-ment of the pairs of meshed gears, at least one of each pair being driven and in turn, driving the other of the pair to provide pump gears, the said driven gears being aligned coaxially, an axle between and connected coaxially to each said adjacent driven gears in a form locking manner;
a spacer in the housing between each adjacent two said driven gears, each of said spacers serving also as a bearing to mount an axle;
a delivery passageway in the housing;
a slot nozzle extending the width of the coating to be applied and to which nozzle the delivery passageway leads from the gear intersections;
the housing being separable along a central plane on which the central surfaces of the passageways and the line of engagement of the gears lie;
and said housing being pivotally connected to open along said central plane to service and clean: the spacers individually, the axles individually, the gearings individually, the passageways and the nozzle.
a housing;
a supply passageway in the housing;
a plurality of pairs of meshed gears in the housing, the supply passageway leading through the housing to the engage-ment of the pairs of meshed gears, at least one of each pair being driven and in turn, driving the other of the pair to provide pump gears, the said driven gears being aligned coaxially, an axle between and connected coaxially to each said adjacent driven gears in a form locking manner;
a spacer in the housing between each adjacent two said driven gears, each of said spacers serving also as a bearing to mount an axle;
a delivery passageway in the housing;
a slot nozzle extending the width of the coating to be applied and to which nozzle the delivery passageway leads from the gear intersections;
the housing being separable along a central plane on which the central surfaces of the passageways and the line of engagement of the gears lie;
and said housing being pivotally connected to open along said central plane to service and clean: the spacers individually, the axles individually, the gearings individually, the passageways and the nozzle.
2. A slot nozzle arrangement as claimed in claim 1, the end driven gear at one side of the axially aligned driven gears is arranged to receive drive, thereby to drive all the axially aligned driven gears through the axles.
3. A slot nozzle arrangement as claimed in claim 1, said spacers being of carbon to serve as carbon bearings.
4. A slot nozzle arrangement as claimed in claim 1, the axial extension of the pump gears being twice the axial length of the spacers.
5. A slot nozzle arrangement as claimed in claim 1, the pump gears being designed to be driven at a speed between about ten and about twelve r.p.m.
6. A slot nozzle arrangement as claimed in claim 1, the housing having a channel therethrough near to and extending the width of the nozzle for one of heating and cooling fluids.
7. A slot nozzle arrangement as claimed in claim 1, further comprising a supply container having an outlet leading to the supply passageway in the housing, said container having walls with heating means.
8. A slot arrangement as claimed in claim 1, further com-prising a rotatable gate valve interposed in and along the width of the delivery passageway in the housing for selectively closing and opening the said delivery passageway.
9. A device for applying a thin coating of a coating mater-ial onto a web moving over a backing roller comprising:
an extrusion die with an elongated narrow nozzle extend-ing the full width of the web;
a delivery channel for delivering coating material to the die;
a container for the material having an outlet;
a plurality of axially aligned, separate, spaced apart gear pumps in the delivery channel for the die interposed between the container and the die, each pump comprising a pair of inter-meshed gears, at least one of each pair being a driven gear, and the driven gears being axially aligned and drivingly connected, each driven gear driving the other gear of the pair;
a plurality of elongated bearings, each pump being spaced apart from the adjacent pump by said bearings;
the die being formed of housing members that are pivotally connected to separate about a central longitudinal plane, including the line of engagement of the gears, thereby to open for cleaning of the die.
an extrusion die with an elongated narrow nozzle extend-ing the full width of the web;
a delivery channel for delivering coating material to the die;
a container for the material having an outlet;
a plurality of axially aligned, separate, spaced apart gear pumps in the delivery channel for the die interposed between the container and the die, each pump comprising a pair of inter-meshed gears, at least one of each pair being a driven gear, and the driven gears being axially aligned and drivingly connected, each driven gear driving the other gear of the pair;
a plurality of elongated bearings, each pump being spaced apart from the adjacent pump by said bearings;
the die being formed of housing members that are pivotally connected to separate about a central longitudinal plane, including the line of engagement of the gears, thereby to open for cleaning of the die.
10. A device as claimed in claim 9, said die having fluid channels in the region of the delivery channel, the gear pumps, and the supply container for one of heating and cooling the coat-ing material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000482999A CA1243482A (en) | 1985-06-03 | 1985-06-03 | Coating device for material webs |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000482999A CA1243482A (en) | 1985-06-03 | 1985-06-03 | Coating device for material webs |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1243482A true CA1243482A (en) | 1988-10-25 |
Family
ID=4130618
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000482999A Expired CA1243482A (en) | 1985-06-03 | 1985-06-03 | Coating device for material webs |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1243482A (en) |
-
1985
- 1985-06-03 CA CA000482999A patent/CA1243482A/en not_active Expired
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |