Abstract: A vacuum drier apparatus capable of preventing the thermal deformation of the protection member as well as scattering of the tempered glass plate in a case of an accidental breaking of the tempered glass plate. The apparatus includes elastic supporter members located between the glass plate and the protection member, for supporting the glass plate and the protection member with respect to each other, such that the glass plate can be pressed tightly to seal off the opening section of the vacuum drying space, while the protection member can be pushed away from an edge of the front side of the opening window by an external pressure exerting on the protection member. The protection member is preferably a transparent plastic plate in an outwardly curving dome-shaped form.

Abstract: A plastic mold decapsuling apparatus for decapsuling a plastic mold by feeding an etchant to the plastic mold comprises an etchant bottle; an etchant tank; a decapsuling plastic mold holder; an etchant feeding pump; and, in particular, a bell-shaped cover cap for shielding a plastic mold to be decapsuled on the mold holder from outside air to maintain pressure of the etchant fed by the etchant feeding pump. Since the plastic mold is shielded, even if the plastic mold is decapsuled, it is possible to maintain the etchant feeding pressure at a constant level without introducing outside air into the etchant recirculating passage, thus permitting a stable decapsuling treatment.

Abstract: The plastic mold decapsuling apparatus comprises an etchant bottle; a heat tank; an etchant reservoir disposed in the heat tank; at least one decapsuling plastic mold holder; a first etchant feeding pump for selectively circulating the etchant from the etchant bottle to the etchant reservoir and discharging waste etchant; and a second etchant feeding pump for feeding the etchant from the reservoir to the plastic mold holder. Since the etchant bottle can be set as it is without transferring the etchant into another vessel, the etchant handling work is safe. Since a required amount of etchant can previously be heated in a reservoir within the heat tank, it is possible to continuously supply a predetermined amount of etchant heated to a constant temperature, thus improving the speed of decapsuling work. Futher, since the etchant is circulated through the decapsuling plastic mold holder, it is possible to firmly decapsule plastic mold devices by use of a relatively mild etchant such as fuming nitric acid.