초록 ▼

A machine for molding bonded plastics material, in particular expanded or foamable polystyrene in combination with rigid sheet polystyrene, wherein the rigid material (2) is preformed in a preforming station (1) in a preforming mold (33, 36) while simultaneously separating by a cutter (40) the prefo

A machine for molding bonded plastics material, in particular expanded or foamable polystyrene in combination with rigid sheet polystyrene, wherein the rigid material (2) is preformed in a preforming station (1) in a preforming mold (33, 36) while simultaneously separating by a cutter (40) the preformed portion from the rigid sheet of starting material to produce separate preformed pieces, the preformed pieces are moved by a transfer table (27) to a molding station (3) while retained on preforming half-mold (33), foamable material (44) is fed to molding mold (41) and molded and bonded on the preformed pieces with sintering by pulse action of steam (45) and, the final molded articles (P) are discharged at discharge station (6). The half-mold (33) is moved alternately between the preforming station (1) and molding station (3), and cooperates with respective counter-molds (36, 41). The scrap is recovered without being involved in the molding stage. The various parts of the machine are controlled by a control device (14) for continuous synchronous cyclical operation.

대표청구항 ▼

A machine for forming and molding plastic material to form bonded molded articles comprising: a frame; a preforming station, a molding station and a discharge station in spaced relationship on said frame; a half-mold movably mounted on said frame for movement into and between said preforming and mol

A machine for forming and molding plastic material to form bonded molded articles comprising: a frame; a preforming station, a molding station and a discharge station in spaced relationship on said frame; a half-mold movably mounted on said frame for movement into and between said preforming and molding stations; preforming mold means mounted on said frame in cooperating relationship with said half-mold in said preforming station for forming at least one portion of a plastic sheet material therebetween; means for feeding said plastic sheet material into a forming position between said half-mold and said preforming mold means; separating means mounted on said preforming mold means and cooperating with said half-mold for separating at least one formed portion of said plastic sheet material from said plastic sheet material to produce at least one preformed piece in said preforming station; molding mold means mounted on said frame in said molding station in cooperating relationship with said half-mold in said molding station for providing a mold cavity between said half-mold and said molding mold for molding foamable plastic material onto said at least one preformed piece positioned by said half-mold in said mold cavity; means for feeding said foamable plastic material to said mold cavity; means for applying steam in the form of steam pulses to said mold cavity for sintering said foamable plastic material and bonding said foamable plastic material to said at least one preformed piece in said mold cavity to form at least one final molded article; half-mold positioning means for moving said half-mold between said preforming and molding stations; mold displacing means for relatively displacing said half-mold and said preforming mold means with respect to each other between a closed forming position and an open position and for relatively displacing said half-mold and said molding mold means with respect to each other between a closed molding position and an open position; and means for removing said at least one final molded article from said machine; said means being synchronously operable so that said half-mold and said preforming mold means are in said open position when said plastic sheet material and said half-mold are in said forming position in said preforming station and at least one previously made final molded article is retained in said molding mold means, said half-mold and said preforming mold means are in said closed position for forming and separating said at least one preformed piece when said at least one previously made final molded article is released from said molding mold means, said half-mold and said preforming mold means are in said open position in said preforming station when at least one preformed piece is retained on said half-mold and said at least one previously made final molded article is removed from said molding mold means, said half-mold and said molding mold means are in said open position when said half-mold is in said molding station and said at least one previously made final molded article is in said discharge station, said half-mold and said molding mold means are in said closed position when said foamable plastic material and said steam are fed to said mold cavity and said at least one previously made final molded article is discharged from said discharge station, said half-mold and said molding mold means are in said open position thereof when said half-mold is in said molding station and said at least one final molded article is retained on said molding mold means, and said final molded article is retained on said molding means when said half-mold is moved to said preforming station and said plastic sheet material is fed to said forming position in said preforming station to begin another cycle.