Summary of thr vacuum freeze dryer
Summary of thr vacuum freeze dryer
Therefore, an object of the subject vacuum freeze dryer is a new and improved resin and paraffin embedding assembly.
Another object of the subject food drying equipment is a resin and paraffin embedding assembly having a support plate which uniformly distributes heat to substantially all portions of the support plate.
A further object of the subject spray dryer is a resin and paraffin embedding assembly which has a support plate which may be easily removed from the assembly for easy cleaning and placement of the tissue embedding cups.
Still another object of the subject grain dryer is a paraffin and resin embedding assembly in which the temperature of the support plate may be accurately controlled.
These and other objects are attained in accordance with the present invention wherein there is provided an improved resin and paraffin embedding assembly. The assembly of the subject invention includes a copper support plate machined to precisetolerances to present a substantially flat upper surface and heated with an electrical resistance cartridge heater which may be removably mounted underneath and adjacent the support plate.
The lower surface of the tissue platen is recessed to provide a downwardly extending lip which serves to both locate the tissue platen on the support plate and to assure more efficient transfer of heat from the support plate to the tissue platen. Maximum contact between the tissue platen and the support plate is attained through the use of a silicone grease which is wiped onto the support plate to form a thin substantially uniform layer.
Refrigerant coils surround thevacuum freeze dryer chamber and condense any vapors emanating from the tissue and the resin or paraffin. The top circumference of the chamber is lined with a rim gasket of a resilient material on which a solid, clearacrylic top plate rests. Under vacuum, the clear top plate is biased against the rim gasket and affords a vacuum tight seal. An opening is provided in an upper wall portion of the freeze drying chamber and through this opening the chamber interior isin communication with a vacuum pump.
Therefore, an object of the subject vacuum freeze dryer is a new and improved resin and paraffin embedding assembly.
Another object of the subject food drying equipment is a resin and paraffin embedding assembly having a support plate which uniformly distributes heat to substantially all portions of the support plate.
A further object of the subject spray dryer is a resin and paraffin embedding assembly which has a support plate which may be easily removed from the assembly for easy cleaning and placement of the tissue embedding cups.
Still another object of the subject grain dryer is a paraffin and resin embedding assembly in which the temperature of the support plate may be accurately controlled.
These and other objects are attained in accordance with the present invention wherein there is provided an improved resin and paraffin embedding assembly. The assembly of the subject invention includes a copper support plate machined to precisetolerances to present a substantially flat upper surface and heated with an electrical resistance cartridge heater which may be removably mounted underneath and adjacent the support plate.
The lower surface of the tissue platen is recessed to provide a downwardly extending lip which serves to both locate the tissue platen on the support plate and to assure more efficient transfer of heat from the support plate to the tissue platen. Maximum contact between the tissue platen and the support plate is attained through the use of a silicone grease which is wiped onto the support plate to form a thin substantially uniform layer.
Refrigerant coils surround thevacuum freeze dryer chamber and condense any vapors emanating from the tissue and the resin or paraffin. The top circumference of the chamber is lined with a rim gasket of a resilient material on which a solid, clearacrylic top plate rests. Under vacuum, the clear top plate is biased against the rim gasket and affords a vacuum tight seal. An opening is provided in an upper wall portion of the freeze drying chamber and through this opening the chamber interior isin communication with a vacuum pump.