초록 ▼

A method of molding a plastic part comprising supporting first and second mold sections so as to define a mold cavity, placing a flexible sheet over the second mold section, and forming a vacuum chamber utilizing the flexible sheet with at least the second mold section being in the vacuum chamber. A

A method of molding a plastic part comprising supporting first and second mold sections so as to define a mold cavity, placing a flexible sheet over the second mold section, and forming a vacuum chamber utilizing the flexible sheet with at least the second mold section being in the vacuum chamber. Air passages are provided between the flexible sheet and the second mold section. The air pressure within the vacuum chamber is reduced to less than ambient to create differential pressure across the flexible sheet to hold the second mold section in position. Plastic material is pumped into the mold cavity. After the plastic sets, the second mold section is removed.

대표청구항 ▼

A method of molding a part comprising: providing first and second mold sections having mold faces of the desired configuration with the second mold section being flexible and with at least one of said mold sections having a plurality of projections and recesses between the projections; supporting th

A method of molding a part comprising: providing first and second mold sections having mold faces of the desired configuration with the second mold section being flexible and with at least one of said mold sections having a plurality of projections and recesses between the projections; supporting the first mold section with the first mold face exposed; supporting the second mold section with the mold faces being in confronting relationship to define a mold cavity between the mold faces; engaging at least some of the projections with the mold face of the other of the mold sections with the recesses at least partially defining the mold cavity and the flexible second mold section following the contour of the mold face of the first mold section; placing a flexible sheet over the second mold section; forming a vacuum chamber utilizing the flexible sheet with at least the second mold section and the mold face of the first mold section being in said vacuum chamber; providing air passage means in the vacuum chamber between the flexible sheet and the second mold section; reducing the pressure in the vacuum chamber including the air passage means to less than ambient; flowing a curable flowable material into the mold cavity; allowing the material in the mold cavity to set to form the desired part; and removing the second mold section from the part in the mold cavity.