Sizer for forming shaped polymeric articles and method of sizing polymeric articles
a polymer article and sizing technology, applied in the field of sizing, can solve the problems of affecting the impact, distortion and shrinkage quality of the product, and achieve the effects of improving the cooling effect of the polymer article, improving production output, and faster production speed
Inactive Publication Date: 2006-04-20
CERTAINTEED CORP
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- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Benefits of technology
The solution enables faster production speeds, improved product performance with reduced stresses and dimension variation, and allows for the use of lighter, cheaper materials for the sizer, while preventing drag and wear through efficient cooling and lubrication.
Problems solved by technology
These cooled-in stresses are known to effect the impact, distortion and shrinkage qualities of the product.
Further, because the cooling liquid pumped into the sizer is the primary means of removing heat from the product, the sizer body itself is not relied upon as the primary heat removal vehicle.
Method used
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Embodiment Construction
[0024]FIGS. 2-3A illustrate an exemplary embodiment of a sizer (also know as a fixture or calibrator) and sizer assembly for providing a shaped polymeric article in an extrusion process. The polymeric article can be any shaped polymeric article originating from a flat sheet or non-flat sheet (e.g., having one or more legs or fins formed therein) exiting an extruder having a profile of uniform or non-uniform thickness or having pre-formed and cooled sections. In an exemplary embodiment, the sizer is shaped to form a siding panel formed from a thermoplastic or thermosetting compositions, such as polyvinyl chloride (“PVC”), polyethylene, polypropylene, polyurethane, epoxy, polyester, or composites thereof (e.g., PVC and wood flour composite), etc. or other similar materials.
[0025]FIG. 2 is a side, cross-sectional view of a sizer 100. An extruded sheet of polymeric material 200 is shown disposed within the sizer 100. As used herein, “sheet of polymeric material” means a sheet of polyme...
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Abstract
A sizer assembly for providing a shaped polymeric article in an extrusion process comprises a sizer body having a product profile channel corresponding to the shaped polymeric article formed therethrough. The sizer body comprises a plurality of cooling liquid inlet slots forming an opening substantially around the product profile channel and a plurality of vacuum slots forming an opening substantially around the product profile channel for removing cooling liquid expelled from said cooling liquid inlet slots.
Description
CROSS-REFERENCE TO RELATED APPLICATION [0001] This application is a divisional application of U.S. patent application Ser. No. 10 / 428,227 filed May 2, 2003, entitled “Improved Sizer for Forming Shaped Polymeric Articles and Method of Sizing Polymeric Articles” now U.S. Pat. No. ______, the entirety of which is hereby incorporated by reference herein.FIELD OF THE INVENTION [0002] The present invention relates to extrusion techniques, and more particularly to sizers used in shaping extruded polymeric articles. BACKGROUND OF THE INVENTION [0003]FIG. 1A illustrates a side elevational view of a prior art sizer 40 used in an extrusion system described in U.S. Pat. No. 6,319,456 to Gilbert et al., entitled “Method for Continuous Vacuum Forming Shaped Polymeric Articles,” issued Nov. 20, 2001, the entirety of which is hereby incorporated by reference. An extruded sheet 10 is subjected to a sizer 40 for mechanical deforming and shaping an extruded sheet. One or more pre-sizers (not shown) ma...
Claims
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IPC IPC(8): B29C47/00B29C48/08B29C48/12B29C48/30B29C48/305B29C48/90
CPCB29C47/0021B29C47/0852B29C47/903B29K2901/00Y10S425/06B29C48/07B29C48/08B29C48/12B29C48/3003B29C48/919B29C48/903B29C48/908
Inventor HARTLEY, KEVIN D.MCELDOWNEY, ROBERT C.GILBERT, THOMAS G.GATES, THOMAS A.
Owner CERTAINTEED CORP