The present disclosure relates to extrusion coating systems, extrusion coated substrates, and processes for making the same. In some aspects, extrusion coating systems as described herein may include an at least partially insulated outlet wall, which may facilitate production of coated substrates ex
The present disclosure relates to extrusion coating systems, extrusion coated substrates, and processes for making the same. In some aspects, extrusion coating systems as described herein may include an at least partially insulated outlet wall, which may facilitate production of coated substrates exhibiting a very desirable surface texture and appearance. Coated substrates of the present invention may be utilized in a variety of end applications, including, but not limited to, interior and exterior construction materials for homes, buildings, and furniture.
대표청구항▼
1. A system for extrusion coating a thermoplastic resin coating material onto an elongated substrate, said system comprising: a die for contacting an elongated substrate with a molten thermoplastic resin coating material to produce a coated substrate,wherein said die comprises an inlet wall, an outl
1. A system for extrusion coating a thermoplastic resin coating material onto an elongated substrate, said system comprising: a die for contacting an elongated substrate with a molten thermoplastic resin coating material to produce a coated substrate,wherein said die comprises an inlet wall, an outlet wall, and a coating chamber disposed at least partially therebetween,wherein said inlet wall comprises a die inlet for receiving said elongated substrate into said die and said outlet wall comprises a die outlet for discharging said coated substrate from said die;an extruder for introducing the thermoplastic resin coating material into the die;an insulating member affixed to said outlet wall,wherein said insulating member has a thermal conductivity less than the thermal conductivity of said outlet wall and comprises a shaped passageway configured to at least partially surround said die outlet to allow said coated substrate exiting said die outlet to pass through said insulating member; anda quench zone located adjacent said insulating member for cooling said coated substrate discharged from said shaped passageway of said insulating member,a second insulating member disposed between said coating chamber and said outlet wall, wherein said second insulating member has a thermal conductivity less than the thermal conductivity of said outlet wall,a feed system located upstream of said die for introducing said substrate into said die inlet, wherein said fee system includes a pushing device operable to push said elongated substrate into said die inlet;wherein said coated substrate has a length of at least 5 feet;wherein said elongated substrate comprises natural wood, wood composites, medium-density fiber board, particle board, oriented strand board, plastic, cellularized PVC, foam, metal, fiberglass, ceramics, cement and combinations thereof; and wherein said resin coating material comprises one or more of polyesters, copolyesters, polycarbonates, acrylics, cellulose esters, polyolefins, nylons, and polyvinylchloride. 2. The system of claim 1, wherein the minimum distance between the edge of said shaped passageway proximate said die outlet and the edge of said die outlet is less than 100 mils. 3. The system of claim 1, wherein the minimum cross-sectional areas of said shaped passageway and said die outlet are within no more than about 25 percent of one another. 4. The system of claim 1, wherein the cross-sectional shape of said shaped passageway and the cross-sectional shape of said die outlet are geometrically similar. 5. The system of claim 1, wherein said shaped passageway has a constant cross-sectional area. 6. The system of claim 1, wherein the cross-sectional shape of said shaped passageway and the cross-sectional shape of said die outlet are congruent. 7. The system of claim 1, wherein at least one of the cross-sectional shapes of said die outlet and said shaped passageway are non-symmetrical. 8. The system of claim 1, wherein each of said die outlet and said shaped passageway have an irregular cross-sectional shape including at least on curvilinear side having both convex and concave sections. 9. The system of claim 1, wherein said thermal conductivity of said insulating member is at least 0.01 and/or not more than 5 W/mK at 25° C. 10. The system of claim 1, which is a continuous system configured to operate at a line speed of least 25 board feet per minute. 11. The system of claim 1, wherein said cooled coated substrate has an average Rmax surface roughness of not more than 30. 12. The system of claim 11, wherein said cooled coated substrate has an average Rmax surface roughness of not more than 40. 13. The system of claim 11, wherein the surface of said cooled coated substrate has less than 10 bubbles per 100 feet. 14. The system of claim 11, wherein said resin coating is extrusion coated onto said surface such that all of the sides of said elongated substrate are completely encapsulated by said resin coating. 15. The system of claim 11, wherein said resin coating layer has an average thickness of at least 2 mils and not more than 40 mils. 16. The system of claim 11, wherein said substrate has two or more coating layers. 17. The system of claim 16, wherein each resin coating layer has an average thickness of at least 2 mils. 18. The system of claim 11, wherein said resin coating is adhered directly to at least a portion of the substrate and has an adhesion peel force of at least 0.10 pounds. 19. The system of claim 11, wherein said substrate has a non-symmetrical lateral cross-sectional shape. 20. The system of claim 11, wherein said substrate has a symmetrical lateral cross-sectional shape.
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