EP3141364B1 - Apparatus for coating the outer contour of a workpiece - Google Patents
Apparatus for coating the outer contour of a workpiece Download PDFInfo
- Publication number
- EP3141364B1 EP3141364B1 EP15002649.0A EP15002649A EP3141364B1 EP 3141364 B1 EP3141364 B1 EP 3141364B1 EP 15002649 A EP15002649 A EP 15002649A EP 3141364 B1 EP3141364 B1 EP 3141364B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- workpiece
- chamber
- nozzles
- coating
- entrance opening
- 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.)
- Not-in-force
Links
- 239000011248 coating agent Substances 0.000 title claims description 41
- 238000000576 coating method Methods 0.000 title claims description 41
- 239000000463 material Substances 0.000 claims description 23
- 239000011796 hollow space material Substances 0.000 claims description 14
- 238000002347 injection Methods 0.000 claims description 2
- 239000007924 injection Substances 0.000 claims description 2
- 239000002966 varnish Substances 0.000 description 8
- 239000012530 fluid Substances 0.000 description 7
- 238000000034 method Methods 0.000 description 3
- 239000002904 solvent Substances 0.000 description 3
- 125000006850 spacer group Chemical group 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 239000003125 aqueous solvent Substances 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C3/00—Apparatus in which the work is brought into contact with a bulk quantity of liquid or other fluent material
- B05C3/02—Apparatus in which the work is brought into contact with a bulk quantity of liquid or other fluent material the work being immersed in the liquid or other fluent material
- B05C3/12—Apparatus in which the work is brought into contact with a bulk quantity of liquid or other fluent material the work being immersed in the liquid or other fluent material for treating work of indefinite length
- B05C3/15—Apparatus in which the work is brought into contact with a bulk quantity of liquid or other fluent material the work being immersed in the liquid or other fluent material for treating work of indefinite length not supported on conveying means
-
- 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
- B05B13/0207—Means for supporting work; Arrangement or mounting of spray heads; Adaptation or arrangement of means for feeding work the work being an elongated body, e.g. wire or pipe
- B05B13/0214—Means for supporting work; Arrangement or mounting of spray heads; Adaptation or arrangement of means for feeding work the work being an elongated body, e.g. wire or pipe the liquid or other fluent material being applied to the whole periphery of the cross section of the elongated body
-
- 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
- B05C3/00—Apparatus in which the work is brought into contact with a bulk quantity of liquid or other fluent material
- B05C3/02—Apparatus in which the work is brought into contact with a bulk quantity of liquid or other fluent material the work being immersed in the liquid or other fluent material
- B05C3/09—Apparatus in which the work is brought into contact with a bulk quantity of liquid or other fluent material the work being immersed in the liquid or other fluent material for treating separate articles
- B05C3/10—Apparatus in which the work is brought into contact with a bulk quantity of liquid or other fluent material the work being immersed in the liquid or other fluent material for treating separate articles the articles being moved through the liquid or other fluent material
-
- 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
- B05C9/00—Apparatus or plant for applying liquid or other fluent material to surfaces by means not covered by any preceding group, or in which the means of applying the liquid or other fluent material is not important
- B05C9/08—Apparatus or plant for applying liquid or other fluent material to surfaces by means not covered by any preceding group, or in which the means of applying the liquid or other fluent material is not important for applying liquid or other fluent material and performing an auxiliary operation
- B05C9/12—Apparatus or plant for applying liquid or other fluent material to surfaces by means not covered by any preceding group, or in which the means of applying the liquid or other fluent material is not important for applying liquid or other fluent material and performing an auxiliary operation the auxiliary operation being performed after the application
-
- 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
- B05B1/14—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means with multiple outlet openings; with strainers in or outside the outlet opening
- B05B1/20—Arrangements of several outlets along elongated bodies, e.g. perforated pipes or troughs, e.g. spray booms; Outlet elements therefor
- B05B1/205—Arrangements of several outlets along elongated bodies, e.g. perforated pipes or troughs, e.g. spray booms; Outlet elements therefor characterised by the longitudinal shape of the elongated body
- B05B1/207—Arrangements of several outlets along elongated bodies, e.g. perforated pipes or troughs, e.g. spray booms; Outlet elements therefor characterised by the longitudinal shape of the elongated body the elongated body being a closed loop
-
- 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
- B05C5/0241—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 for applying liquid or other fluent material to elongated work, e.g. wires, cables, tubes
-
- 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
- B05C5/0254—Coating heads with slot-shaped outlet
Definitions
- the apparatus according to the present invention comprises an application unit for applying the coating onto the workpiece with more than four nozzles for injecting the coating material into the above-defined hollow space.
- Such nozzles are arranged regularly around the above-mentioned entrance opening and it has been found surprisingly that by using at least six nozzles the uniformity (evenness) of the coating achieved on the workpiece is improved substantially, in particular with workpieces having a complex contour (profile).
- the achieved coating has a uniform thickness all over the workpiece and is continuous, i.e. without gaps or interruptions.
- the inventive apparatus comprises more than four, preferably six or more, nozzles adapted for injection of coating material into said hollow space wherein the nozzles are arranged at a curve (cam) surrounding said entrance opening of the chamber at a radial distance with an average pitch angle between the nozzles centers of 60° or smaller.
- the pitch angle is defined by the radii connecting a center of the entrance opening with a center of the respective nozzles.
- the above-defined chamber in which the pressure is lower than outside the chamber is equipped with at least four vacuum ports for evacuating the chamber.
- Such vacuum ports are connected to one or more pumps.
- at least one vacuum port is provided on top of the chamber, at least one vacuum port is provided at the bottom of the chamber, and at least one vacuum port is provided at each side wall of the chamber.
- the plates 20, 22 and the profile plate 18 are attached at chamber 10 directly or indirectly, preferably removably such that the chamber 10 can be equipped with different plates.
- the distance D2 between plates 20 and 22 defines in the embodiment shown in Fig. 1 the diameter of the nozzle-like slot 24 and that distance can be adjusted by a ring-shaped spacer 30. Spacers 30 of different strengths are provided for adjusting the diameter size of the nozzle-like slot 24 and the size of hollow space 42.
- Fig. 3 shows the passage of a workpiece 44 through profile plate 18.
- the distance D 1 between the outer contour (profile) of the workpiece 44 and the inner contour (profile) of the plate 18 is constant, in the shown embodiment that distance is all around the contours at about 1 mm.
- the matching of both contours is such that the workpiece passes through the opening with minimum friction and such that the workpiece itself covers the entrance opening as much as possible so that the entering of air into the chamber is minimized.
- the workpiece can be supported in front of the entrance opening 14.
Landscapes
- Coating Apparatus (AREA)
Description
- The invention concerns an apparatus for coating the outer contour of a workpiece comprising a chamber, a pump for generating a pressure inside the chamber smaller than the pressure outside the chamber, an entrance opening (leading opening) through which the workpiece can be moved into the chamber, an exit opening (trailing opening) through which the workpiece can be moved out of the chamber, and an application unit for applying coating onto the workpiece, the application unit comprising at least two plates surrounding the entrance opening and defining in between the plates a hollow space through which the coating flows in direction of said entrance opening. Such an apparatus is known from
EP 2 628 549 A1 .
German patentDE 43 37 438 C2 describes an apparatus for coating a workpiece with two separate nozzles at the entrance opening for applying a coating onto a workpiece.
The technology of the above-mentioned type is also called "passage-coating" (Durchlaufbeschichten).
The apparatus according toEP 2 628 549 A1 comprises four nozzles injecting the coating (e.g. varnish) into a hollow space formed between two plates at the entrance opening of a chamber. - Other similar coating apparatuses are disclosed by
EP 2 409 778 A1 andEP 2 253 385 A1 . - The technical problem underlying the present invention is to improve the prior art apparatuses such that, in particular in connection with workpieces having a relatively complex profile, a coating is achieved that is very homogenous and continuous all around the workpiece, i.e. the coating is complete and has a uniform thickness.
A typical workpiece to be coated by an apparatus according to the present invention is an elongated element made of plastic, like a so-called "profile" of a window or a door. Such elements, e.g. beams ("profiles") of window sashs, typically have a cross-section with a relatively complicated contour comprising recesses, cavities, protrusions, undercuts etc. creating an obstacle against obtaining a continuous coating of uniform thickness all over the coated workpiece. Another typical example of a workpiece that can be coated by means of the apparatus according to the present invention is an elongated element made of wood or wood-like material. - A typical coating material applicable to a workpiece by means of an apparatus according to the present invention is a varnish or a liquid color. The apparatus according to the present invention is most useful in coating a workpiece with colors having no high concentration of a solvent, in particular without aqueous solvent. The viscosity of the coating material is preferably in a range of 25 to 200 mPa x s. In connection with a varnish preferably no solvent is used, in particular no water or other solvent is added. A varnish is preferably used at a temperature of 40 to 60°C and the apparatus is preferably kept on that temperature. A varnish providing good results when being applied onto a workpiece with an apparatus according to the present invention is called "High Solid" with 90 to 100% resin. Also UV-crosslinkable varnishes can be used.
- According to a variant the apparatus according to the present invention comprises an application unit for applying the coating onto the workpiece with more than four nozzles for injecting the coating material into the above-defined hollow space. Such nozzles are arranged regularly around the above-mentioned entrance opening and it has been found surprisingly that by using at least six nozzles the uniformity (evenness) of the coating achieved on the workpiece is improved substantially, in particular with workpieces having a complex contour (profile). The achieved coating has a uniform thickness all over the workpiece and is continuous, i.e. without gaps or interruptions.
- According to a variant of the present invention at least six nozzles are arranged around the entrance opening of the chamber at a radial distance with regard to the center line (direction) of conveyance of the workpiece.
- The inventive apparatus comprises more than four, preferably six or more, nozzles adapted for injection of coating material into said hollow space wherein the nozzles are arranged at a curve (cam) surrounding said entrance opening of the chamber at a radial distance with an average pitch angle between the nozzles centers of 60° or smaller. The pitch angle is defined by the radii connecting a center of the entrance opening with a center of the respective nozzles.
- With the present invention a homogenous varnish coating can be obtained with a thickness in the range of 5 to 50 µm.
- According to another variant of the present invention the above-defined chamber in which the pressure is lower than outside the chamber is equipped with at least four vacuum ports for evacuating the chamber. Such vacuum ports are connected to one or more pumps. According to a variant of the invention, at least one vacuum port is provided on top of the chamber, at least one vacuum port is provided at the bottom of the chamber, and at least one vacuum port is provided at each side wall of the chamber. Providing at least four vacuum ports this way for evacuating the chamber through which the workpiece is conveyed results in better flow conditions of the coating material in the chamber and in the transitional area from said hollow space into the chamber to achieve a homogeneous and complete coating of the workpiece.
- Below an embodiment of the invention is described in detail with reference to the figures:
-
Fig. 1 is a vertical cross-section of a chamber (10) of an apparatus according to the present invention; -
Fig. 2 is a plan view of an outer plate (22) in direction ofarrow 12 ofFig. 1 ; and -
Fig. 3 shows the profile plate (18) with a workpiece (44) in detail. - A workpiece 44 (
Fig. 3 ) is conveyed in direction ofarrow 12 through thechamber 10 shown inFig. 1 . Theworkpiece 44 is introduced through an entrance opening 14 into thechamber 10 and conveyed out of thechamber 10 through anexit opening 16. - The
entrance opening 14 is defined by aprofile plate 18 which surrounds the entrance opening. - Two
plates hollow space 42. Theprofile plate 18 is fixed at theouter plate 22 by means of screws 48 (Fig. 2 ). - The
plates allaround slot 24 surrounding theentrance opening 14. Theslot 24 is continuous, i.e. surrounds completely aworkpiece 44 moved through opening 14. - Coating material (not shown) is introduced into the
hollow space 42 between theplates nozzles Fig. 2 (but not inFig. 1 ). The coating material is a fluid and passes thehollow space 42 in the direction ofarrows 36, i.e. radially inwards with regard to the vector ofdirection 12 of conveyance of the workpiece. -
Slot 24 surrounding theentrance opening 14 completely serves as a nozzle for spraying the coating material, e.g. varnish, onto the workpiece passing theopening 14. The coating material is sprayed onto the workpiece from all directions, e.g. the spraying is performed continuously over 360° around the workpiece and the sprayed material forms a "curtain" of coating material through which the workpiece is moved. - The
plates profile plate 18 are attached atchamber 10 directly or indirectly, preferably removably such that thechamber 10 can be equipped with different plates. The distance D2 betweenplates Fig. 1 the diameter of the nozzle-like slot 24 and that distance can be adjusted by a ring-shaped spacer 30.Spacers 30 of different strengths are provided for adjusting the diameter size of the nozzle-like slot 24 and the size ofhollow space 42. - The
profile plate 18 has a profile 26 (Figs. 2 and 3 ) that corresponds exactly to the outer contour (profile) of the workpiece 44 (Fig. 3 ). - In the embodiment shown in
Figs. 1 and2 , the profile plate is separate from theouter plate 22. However, the profile plate can be integral with theouter plate 22. In that case, the outer plate has radially inwardly a contour matching exactly the outer contour of the workpiece (seeFig. 3 ). - Furthermore, the embodiment shown in
Figs. 1 and2 can be amended such that theinner plate 20 can be replaced by the outer wall ofchamber 10. - The embodiment shown in
Figs. 1 and2 can also be amended such that theprofile plate 18 also forms theslot 24. -
Fig. 2 shows in detail theouter plate 22 to which theprofile plate 18 is removably attached byscrews 48.Nozzles Fig. 1 ) surround the entrance opening 14 ofchamber 10. The means to flow the fluid containing the coating material to thenozzles 46a to 46f, i.e. the pressure generating pumps and lines, are not shown in the figures (seeEP 2 628 549 A1 ). Thechamber 10 is evacuated through fourports 32, 32a (only two ports are shown) by means of a pump (not shown). Therefore, coating material entering thechamber 10 is evacuated fromchamber 10 through the ports. In the embodiment, fourports 32 are provided, one port on top ofchamber 10, one port at the bottom ofchamber 10, and two ports at the sides ofchamber 10. - The
nozzles curve 52 surrounding the entrance opening 14. In the embodiment according toFig. 2 , thecurve 52 is circular. Apitch angle 50 is defined between radii from the center ofcurve 52 to the nozzles. Thepitch angle 50 is, in the embodiment shown inFig. 2 , 60°. The pitch angle can also be smaller than 60°. Preferably, thepitch angle 50 between adjacent nozzles is equal. - The fluid containing the coating material is pumped through
nozzles 46a to 46f into thehollow space 42 with high pressure and then sprayed through theslot 24 homogeneously onto theworkpiece 44 passingentrance opening 14. -
Fig. 3 shows the passage of aworkpiece 44 throughprofile plate 18. The distance D1 between the outer contour (profile) of theworkpiece 44 and the inner contour (profile) of theplate 18 is constant, in the shown embodiment that distance is all around the contours at about 1 mm. The matching of both contours is such that the workpiece passes through the opening with minimum friction and such that the workpiece itself covers the entrance opening as much as possible so that the entering of air into the chamber is minimized. The workpiece can be supported in front of theentrance opening 14. - The
slot 24 surrounding the workpiece all around is as close as possible to the workpiece. - The process parameters, in particular the pressure of the coating material in the
hollow space 42, the distance between theslot 24 and theworkpiece 44, the pump power for removing the excess coating material out ofchamber 10, the speed of conveyance of the workpiece etc. are such that the flow of the fluid carrying the coating material to the workpiece is as laminar as possible. Such process parameters can be determined experimentally with a given apparatus and in dependency from the workpiece to be coated. It has been found that for obtaining mostly laminar flow of the fluid containing the coating material in the entrance opening 14 it is helpful to provide theslot 24 with sharp edges. - The following parameters have been found to be appropriate in connection with the illustrated apparatus. The
slot 24, at its radial inner edge, has a diameter in the range from 0,5 to 2 mm, preferably in the range of 0,8 to 1,5 mm and, most preferable, in the range of 1 mm ± 0,2 mm. - The distance between the inner edge of the
profile plate 18 and the outer contour of the workpiece is e.g. in the range from 0.5 to 3 mm, in particular in the range from 1 to 3 mm and, most preferably in the range from 1 to 2 mm. - The process parameters regarding the geometrical dimensions of the
slot 24 and the distance between the slot and the workpiece depend from the nature of the fluid carrying the coating material, in particular the viscosity, and the speed of conveyance of the workpiece and they can be optimized experimentally.
Claims (8)
- Apparatus for coating the outer contour of a workpiece, comprising- a chamber (10),- a pump for generating a pressure in the chamber (10) that is smaller than the pressure outside the chamber (10),- an entrance opening (14) through which the workpiece (24) can be conveyed into the chamber (10),- an exit opening (16), through which the workpiece (44) can be conveyed out of the chamber (10), and- an application unit (20, 22, 24) for applying the coating onto the workpiece (44) comprising at least two plates (20, 22), which surround said entrance opening (14) and which form a hollow space (42) through which coating material flows to said entrance opening (14), and nozzles adapted for injection of coating material into said hollow space (42),characterized in that- said nozzles (46a, 46b, 46c, 46d, 46e, 46f) are arranged at a curve (52) surrounding said entrance opening (14) such that an average pitch angle (50) between the nozzles is 60° or smaller.
- Apparatus according to claim 1, wherein said curve (52) has a radial distance from said entrance opening.
- Apparatus according to one of the claims 1 or 2, wherein each pitch angle (50) between neighboring nozzles is 60° or smaller.
- Apparatus according to one of the preceding claims, wherein said curve (52) is a circle.
- Apparatus to one of the preceding claims, wherein said nozzles (46) are mounted at one (22) of said plates (20, 22).
- Apparatus according to one of the preceding claims, comprising a profile plate (18) removably attachable at one of said two plates (20, 22) and having a profile adapted to the profile of the workpiece (44).
- Apparatus according to one of the preceding claims, comprising an exit plate (28) removably attached to the chamber (10) at said exit opening (16) and forming said exit opening (16) with a profile that is adapted to the profile of the workpiece (44).
- Apparatus according to one of the preceding claims, wherein said chamber (10) comprises four or more ports adapted to be connected to one or more pumps for evacuating the chamber.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP15002649.0A EP3141364B1 (en) | 2015-09-10 | 2015-09-10 | Apparatus for coating the outer contour of a workpiece |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP15002649.0A EP3141364B1 (en) | 2015-09-10 | 2015-09-10 | Apparatus for coating the outer contour of a workpiece |
Publications (2)
Publication Number | Publication Date |
---|---|
EP3141364A1 EP3141364A1 (en) | 2017-03-15 |
EP3141364B1 true EP3141364B1 (en) | 2018-03-14 |
Family
ID=54145517
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP15002649.0A Not-in-force EP3141364B1 (en) | 2015-09-10 | 2015-09-10 | Apparatus for coating the outer contour of a workpiece |
Country Status (1)
Country | Link |
---|---|
EP (1) | EP3141364B1 (en) |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4337438C2 (en) | 1993-11-03 | 1996-03-14 | Schiele Josef | Process for continuous vacuum all-round coating and vacuum continuous all-round coating chamber for carrying out the method |
EP2253385B1 (en) * | 2009-05-15 | 2013-04-24 | Cefla Deutschland GmbH | Coating device and method for wet varnishing of elongated workpieces |
DE202010010497U1 (en) * | 2010-07-21 | 2011-10-24 | Delle Vedove Deutschland Gmbh | Coating device for elongated workpieces |
EP2628549A1 (en) | 2012-02-15 | 2013-08-21 | Veka AG | Device for enveloping a workpiece |
-
2015
- 2015-09-10 EP EP15002649.0A patent/EP3141364B1/en not_active Not-in-force
Non-Patent Citations (1)
Title |
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None * |
Also Published As
Publication number | Publication date |
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EP3141364A1 (en) | 2017-03-15 |
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