Die assembly

Abstract

The invention discloses a die assembly, which comprises a movable die and a fixed die which are matched with each other, and a radial expansion mechanism which is arranged in a center of the fixed die. The radial expansion demoulding mechanism comprises an elastic element, a slanting block and a radial expansion member; the elastic element and the slanting block are sequentially sleeved on a central spindle of the fixed die; a lower end of the elastic element is pressed against the bottom of a central slot of the fixed die, while an upper end is pressed against a lower end of the slanting block; an upper end face of the slanting block is separately pressed against an upper end of the central spindle of the fixed die; the radial expansion member is pivoted in the central slot of the fixed die, and pressed against the slanting block in a buckling shape in a matched way by taking the central spindle of the fixed die as a center; an upper end of the radial expansion member is protruded, passes through a center hole of a disc and then is horizontally bent towards to form a draw hook for pressing the disc, so that the disc is rapidly separated from a mother disc conveniently, the phenomenon of demolding failure is avoided, and the stability of demolding is ensured; and the movable die is pushed downwards to enable the central spindle of the movable die to push the slanting block downwards, and the slanting block drives the radial expansion member to rotate, so that the draw hook moves over the center hole of the disc to relieve the press of the disc.

Description

technical field [0001] The invention relates to an optical disc production system, and more particularly relates to a compression molding device for an optical disc. Background technique [0002] With the continuous expansion of the information capacity of optical storage media, the production technology of optical storage media is also developing vigorously. Taking the production system of BD50 and DVD9 as examples, the production of BD50 system: injection molding of 1.1 After the mm thick substrate is cooled by the cooling belt, the total reflection layer is sputtered, and then the glue layer of the 23um space layer is spin-coated, UV-cured, and then the glue replication layer of 2um is spin-coated, and enters the compression molding device to copy the information layer. Then sputter the semi-reflective layer, then spin-coat a 75um cover layer, UV cure, then spin-coat a 2um hardcoat protective layer, UV cure, reverse the disc, sputter a SiN waterproof layer, online detecti...

AI Technical Summary

Problems solved by technology

Under normal conditions, this method can successfully complete demoulding, but due to the instability of compressed air itself, the non-uniformity of glue viscosity and shrinkage, changes in ambient temperature and humidity during process implementation, and other uncertain factors , leading to the phenomenon that demoulding is unsuccessful after the molding is completed or the blowing time needs to be prolonged to successfully demould, and the occurrence of these phenomena may affect the yield or affect the production cycle

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