Thin sheet forming roll, sheet forming machine, and sheet forming method
AssigneeModern Machinery Co., Ltd.
InventorAkira Shimizu
Life of this patent
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Abstract
A thin sheet forming roll includes a metallic elastic external cylinder (102) comprising a metal tube capable of elastic deformation, a shaft portion (103) for closing both ends of the metallic elastic external cylinder (102), and a cooling fluid (104) filled under an internal pressure into the metallic elastic external cylinder (102). When a melt resin from a die of an extruder is pinched between the roll and an opposite roll, that part of the metallic elastic external cylinder (102) which is pressed against the melt resin changes into a shape adapted to the outer diameter of the opposite roll, because the metal tube of the metallic elastic external cylinder (102) is elastically deformable against the pressure of the cooling fluid. Thus, a smooth thin sheet free from bank marks is formed.
Claims8
A thin sheet forming roll for forming a thin sheet by pinching a thermoplastic resin between at least two rolls while cooling it, said thin sheet forming roll comprising:
- a metallic elastic external cylinder;
- a shaft portion for closing both ends of the metallic elastic external cylinder;
- and
- an elastic roll capable of elastic deformation and rotation about the shaft portion disposed inside the metallic elastic external cylinder.
A thin sheet forming machine for guiding a melt resin, extruded from a die of an extruder, to at least two metallic rolls, and pinching both surfaces of the melt resin between the surfaces of the rolls, while cooling the melt resin, to form a thin sheet;
- wherein at least one of the metallic rolls is a thin sheet forming roll comprising:
- a metallic elastic external cylinder comprising a metal tube capable of elastic deformation;
- a shaft portion for closing both ends of the metallic elastic external cylinder;
- and
- an elastic roll capable of elastic deformation and rotation about the shaft portion disposed inside the metallic elastic external cylinder.
Dependencies are inferred from the claim text.