Mould assembly for foam moulding of plastic materials
AssigneeNippon Steel Chemical Co., Ltd.
InventorsAkifumi Hayakawa, Akira Aiba, Eiki Orihara, Kiyoshi Fukushima
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Abstract
Mould assembly for foam moulding of plastic materials, which comprises stationary and movable dies and an auxiliary die plate device between the stationary and movable dies. A gas passage is formed for introducing pressurized inert gas into the mould cavity. The auxiliary die device comprises separated inner and outer auxiliary dies both being spring biased toward the stationary die. O-ring seals are disposed between the opposite surfaces of the outer auxiliary die and the stationary and movable dies.
Claims5
Mould assembly for foam moulding which comprises a stationary die, a movable die co-operating with said stationary die to form a mould cavity therebetween and movable to change the volume of said mould cavity, auxiliary die means disposed between said stationary and movable dies and having surface means exposed to said mould cavity, means operatively associated with one of said stationary and movable dies for biasing said auxiliary die means toward the other of said stationary and movable dies, means for introducing pressurized gas into said mould cavity, means for drawing gas from said mould cavity, and seal means disposed between said auxiliary die means and said stationary and movable dies, said auxiliary die means including a first auxiliary die having said surface means exposed to said mould cavity and a second auxiliary die located radially outside the first auxiliary die, said first and second auxiliary dies being independently biased by said biasing means, said seal means being disposed between said second auxiliary die and said stationary and movable dies.
Dependencies are inferred from the claim text.