초록 ▼

A process for producing reinforced laminate plastic panel structures by thermoplastic compression employing internal mold mandrels which are significantly embrittled during or subsequent to the compression step. Hat stiffened panels formed from two thermoplastic resin sheets may be produced by using

A process for producing reinforced laminate plastic panel structures by thermoplastic compression employing internal mold mandrels which are significantly embrittled during or subsequent to the compression step. Hat stiffened panels formed from two thermoplastic resin sheets may be produced by using elongated mandrels formed of ceramic particulate material adhered together by a binder such as an alkali metal silicate. The mandrels are arranged between a skin sheet and hat stiffener sheets with the respective sheets disposed between the platens of a hydraulic press or other suitable compression molding mechanism. Sandwich laminate structures can be formed employing free thermoplastic resin sheets with a first set of ceramic particulate mandrels interposed between one adjacent pair of sheets and a second set of such mandrels interposed between the other adjacent pair of sheets.

대표청구항 ▼

In a method for the formation of a reinforced laminate panel structure, the steps comprising: (a) disposing a first sheet formed of a thermoplastic resin on a first molding member having a female mold receptacle; (b) disposing a mold mandrel conformable to said mold receptacle and formed of particul

In a method for the formation of a reinforced laminate panel structure, the steps comprising: (a) disposing a first sheet formed of a thermoplastic resin on a first molding member having a female mold receptacle; (b) disposing a mold mandrel conformable to said mold receptacle and formed of particulate ceramic material and a binder functioning as an adhesive between the said ceramic material at a location opposite said mold receptacle whereby said thermoplastic resin sheet is interposed between said mold receptacle and said mandrel; (c) disposing a second thermoplastic resin sheet over said mandrel whereby said mandrel is interposed between said first and second sheets; (d) subsequent to step (b) heating at least said first thermoplastic resin sheet to the melt point of said sheet to render said sheet deformable and compressing said mandrel into said mold receptacle to shape said first sheet to the conforming profiles of said mandrel and said receptacle; (e) subsequent to or concomitant with step (d), heating said second thermoplastic resin sheet to the melt point thereof; (f) subsequent to step (c) and subsequent to or concomitant with step (e) compressing said first and second sheets together while said first and second sheets are heated to the melt points thereof and thereafter allowing said sheets to cool so that such sheets are laminated together and the portion of said first sheet in said receptacle is shaped conformably to the profiles of said mandrel and said receptacle; and (g) concomitant with or subsequent to the heating of step (f) disrupting the binder integrity in said mold to cause said ceramic particulate material to be in a frangible condition and withdrawing said particulate material from between said first and second sheets.