초록 ▼

A peripherally encapsulated product, such as an oven door outer shell, is molded in accordance with this invention by placing a piece of glass between mold clamping portions of relatively movable closed bodies when the latter are in an open position. Preferably both bodies are heated and thermosetti

A peripherally encapsulated product, such as an oven door outer shell, is molded in accordance with this invention by placing a piece of glass between mold clamping portions of relatively movable closed bodies when the latter are in an open position. Preferably both bodies are heated and thermosetting polymeric material (SMC or BMC) is placed upon selected areas of one of the mold bodies within and about an area corresponding to an annular mold cavity and outboard of a peripheral edge of a piece of glass. The glass is clamped between mold clamping portions of the mold bodies which are then progressively closed creating compression forces which extrude the thermosetting polymeric material into the annular cavity and into complete encapsulation of the continuous peripheral edge of the piece of glass. The thermosetting polymeric material is cured, the mold bodies are opened and the product is removed therefrom. The encapsulated product can be provided with post-formed vent openings and/or handle attaching openings or the handle can be integrally molded during the molding process.

대표청구항 ▼

A peripherally encapsulated product, such as an oven door outer shell, is molded in accordance with this invention by placing a piece of glass between mold clamping portions of relatively movable closed bodies when the latter are in an open position. Preferably both bodies are heated and thermosetti

A peripherally encapsulated product, such as an oven door outer shell, is molded in accordance with this invention by placing a piece of glass between mold clamping portions of relatively movable closed bodies when the latter are in an open position. Preferably both bodies are heated and thermosetting polymeric material (SMC or BMC) is placed upon selected areas of one of the mold bodies within and about an area corresponding to an annular mold cavity and outboard of a peripheral edge of a piece of glass. The glass is clamped between mold clamping portions of the mold bodies which are then progressively closed creating compression forces which extrude the thermosetting polymeric material into the annular cavity and into complete encapsulation of the continuous peripheral edge of the piece of glass. The thermosetting polymeric material is cured, the mold bodies are opened and the product is removed therefrom. The encapsulated product can be provided with post-formed vent openings and/or handle attaching openings or the handle can be integrally molded during the molding process. ed on the coated fiber material, of the binder is mixed with the coated fiber material. 5. The process according to claim 2, wherein the coating polymer is a polyaddition product or polycondensation product. 6. The process according to claim 2, wherein the coating polymer is made sufficiently soft so that the pressing composition produced therefrom is compressible. 7. The process according to claim 2, wherein the binder is made harder and more brittle than the coating polymer. 8. The process according to claim 1, wherein the fiber material is mixed in a single-stage process with the binder to form the pressing composition. 9. The process according to claim 8, wherein the binder is from about 20 to 50% by weight of the amount of fiber material. 10. The process according to claim 1, wherein the binder has a low viscosity before curing, and the pressing occurs after the binder has reached a highly viscous consistency during the curing reaction. 11. The process according to claim 1, wherein in that the amount the binder and catalyst are such that the curing reaction commences with a time delay after the mixing and the introducing. 12. The process according to claim 1, wherein the pressure is increased stepwise or continuously in proportion to an increase in solidity of the binder. 13. The process according to claim 1, wherein the fiber material has a length of at least 10 mm. 14. The process according to claim 1, wherein the binder is based on phenolic resin systems or polyurethane. 15. The process according to claim 1, wherein the binder is a polyurethane comprising a polyether resin component and a polyisocyanate component. 16. The process according to claim 15, wherein the catalyst comprises one or more amines. 17. The process according to claim 16, wherein the catalyst is selected from the group consisting of methylamine, dimethylamine, trimethylamine, ethylamine, diethylamine, triethylamine, and dimenthylethylamine. 18. The process according to claim 15, wherein the catalyst is a gas. 19. The process according to claim 18, further comprising feeding the gaseous catalyst into the pressing mold holding the pressing composition after the introducing. 20. The process according to claim 18, wherein the gaseous catalyst is introduced laterally into the pressing mold. 21. The process according to claim 15, wherein the catalyst is added to the pressing composition as a liquid enclosed in microcapsules, and the microcapsules are destroyed under the action of the binder after the introducing. 22. The process according to claim 1, wherein the binder is based on acid-curing or SO2-curing systems. 23. The process according to claim 22, wherein the binder is based on furan resins or phenolic resins. 24. The process according to claim 22, wherein the binder is based on phenolic resins comprising phenols, formaldehyde and hexamethylenetetramine. 25. The process according to claim 1, wherein the fillers comprise carbon dust, carbon black, and graphite. 26. Process for producing close-to-final-shape moldings from pressing compositions, comprising: forming a pressing compound by mixing fiber material selected from the group consisting of reinforcing fibers, fiber bundles, fiber fabrics, fiber mats, and random fiber agglomerates being composed of at least one of metal, glass, carbon, nitrogen, silicon, and boron, a binder comprising polyurethane having a polyether resin component and a polyisocyanate component, a catalyst for initiating a curing reaction, the catalyst being a liquid enclosed in microcapsules, and optionally, one or more additives or fillers; introducing the pressing composition into a pressing mold; pressing the pressing composition in the pressing mold under the action of a first pressure to break the microcapsules and a second pressure to give a molding, with the second pressure only being applied after the curing reaction has commenced; and removing of the molding from the pressing mold.