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US 2003/0155687 A1Published application
Structural reaction injection molding process having void reduction
OwnerJoseph T. Donattiinventor
Life of this patent
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Abstract
A structural reaction injecting molding process which includes the placing of a high loft glass mat in the mold prior to the injection of the polyurethane. The high loft glass mat is placed in the mold at a location where bubbles and voids are likely to occur. The high loft glass mat reduces the formation of bubbles and stabilizes the cell structure of the completed molded component.
Claims15
A method for molding a plastic component comprising:
- placing a fiberglass mat on the surface of the upper half of a two-part mold;
- placing a high loft glass mat in the cavity of a lower half of the two-part mold;
- said high loft glass mat being placed in a location where bubbles and voids are likely to occur;
- dispensing a liquid plastic material into the lower half of the two-part mold covering the surface of the mold and the high loft glass mat;
- closing the two-part mold;
- curing the liquid plastic material;
- and
- opening the two-part mold and removing the molded component.
5 more elements
A method for improving a structural reaction injection molding process for void reduction comprising:
- placing a high loft glass mat on the lower half of a two-part mold in a region where bubbles and voids in an injected plastic material can occur;
- dispensing the SRIM material on the lower half of the two-part mold;
- closing the mold;
- and
- curing the SRIM material in the two-part mold.
2 more elements
A method for molding a door panel comprising:
- attaching a glass mat to the upper half of a two-part mold;
- placing a high loft glass mat on the lower half of the two-part mold in a region where bubbles and voids could be generated;
- mixing polyol and at least isocyanate to form polyurethane;
- dispensing the polyurethane on the lower half of the two-part mold and the high loft glass mat;
- closing the two-piece mold and curing the polyurethane;
- and
- removing the molded door panel from the mold after the polyurethane is cured.
4 more elements
Dependencies are inferred from the claim text.