US 4,233,006 AGranted

Machine for forming expanded resinous products

AssigneeWheaton Industries

InventorWalter Panas

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Abstract

Apparatus for molding expandable thermoplastic resin particles having opposed mold platens. The platens having male and female mold members mounted thereon. The first platen having heated and cooled male mold members mounted thereon, and the second platen having heated and cooled female mold members mounted thereon. Tie bars extending between the first and second platens. Means for feeding expandable thermoplastic resin particles to the mold cavities defined by the male and female mold members when they are engaged together. Means for transfering the mold members from a first position wherein the heated and cooled mold members on the respective platens would be opposed to each other, and in a second position wherein the heated mold member on one platen would be opposed to the cool mold member on the other opposing platen. Means to clamp the mold members together during molding of the expandable thermoplastic resin particles.

Claims25

Dependent claims

Apparatus for molding heat expandable cellular resin products comprising mating heated male and female molds and mating cooled male and female molds, said heated and said cooled male molds positioned on a first platen and said heated and said cooled female members positioned on a second platen, said platens including means for moving at least one of said platens toward and away from the other of said platens and thereby for opening and closing said mating molds, one of said platens further including mold transfer means for moving said heated mold mounted thereon from a first mold transfer limit position, in which said mating heated and mating cooled male and female molds face one another, to a second mold transfer limit position, in which said heated mold on said platen with mold transfer means is moved into a position facing said cooled mold on the opposite platen, the edges of said heated molds in said first mold transfer position remain slightly spaced from one another when said platens are in said mold closed position, one of said platens including movable heated mold mounting means adapted to be moved relative to said platen in the platen mold closure direction, after said platens are in the platen mold closed position, whereby the edges of said heated molds are brought into contact with one another, the cooled mold on said platen with mold transfer means including ejection means adapted to eject a cooled product retained thereon, said apparatus further including means for introducing heat expandable cellular resin into said heated male and female molds, upon engagement thereof.

Apparatus for molding heat expandable cellular resin products comprising mating heated male and female molds and mating cooled male and female molds, said heated and said cooled male molds positioned on a first platen and said heated and said cooled female members positioned on a second platen, one of said platens is movable and the other of said platens is fixed, platen actuation means adapted upon actuation thereof to move said movable platen from a mold open limit position to a mold closed limit position in which facing male and female molds on said platens engaged one another, said platen actuation means consisting of a plurality of parallel tie rods attached to said movable platen and extending through bushings therefore attached to said fixed platen, and means for reciprocably driving said tie rods, whereby said movable platen is driven between said mold opened and mold closed position, one of said platens further including mold transfer means for moving said heated mold mounted thereon from a first mold transfer limit position, in which said mating heated and mating cooled male and female molds face one another, to a second mold transfer limit position, in which said heated mold on said platen with mold transfer means is moved into a position facing said cooled mold on the opposite platen, the cooled mold on said platen with mold transfer means including ejection means adapted to eject a cooled product retained thereon, said apparatus further including means for introducing heat expandable cellular resin into said heated male and female molds, upon engagment thereof.

Dependencies are inferred from the claim text.