초록 ▼

An apparatus for the thermal pressure forming of plastic blanks into containers includes several elements. A heater brings the plastic blanks to a melt phase by heating them to a melting temperature sufficient to relieve internal stresses therein. A conveying arrangement takes the plastic blanks thr

An apparatus for the thermal pressure forming of plastic blanks into containers includes several elements. A heater brings the plastic blanks to a melt phase by heating them to a melting temperature sufficient to relieve internal stresses therein. A conveying arrangement takes the plastic blanks through the heater. This conveying arrangement includes a device for preventing the plastic blanks from reaching the melting point only along their outer peripheral edges so that the plastic blanks maintain dimensional stability. Thereafter, a press forms the plastic blanks into retortable containers.

대표청구항 ▼

An apparatus for the thermal pressure forming of plastic blanks into containers that can withstand temperatures and pressures of a retort chamber without undergoing significant and permanent distortion, comprising: a. a means for bringing plastic blanks from a solid phase to a melt phase by heating

An apparatus for the thermal pressure forming of plastic blanks into containers that can withstand temperatures and pressures of a retort chamber without undergoing significant and permanent distortion, comprising: a. a means for bringing plastic blanks from a solid phase to a melt phase by heating said plastic blanks to a melting temperature sufficient to relieve internal stresses in said plastic blanks; b. means for conveying the plastic blanks through the heating means, said conveying means including means for preventing the plastic blanks in the solid phase from going into the melt phase only along outer peripheral edges thereof so that the plastic blanks maintain their hoop strength and peripheral dimensions; and c. means for forming the plastic blanks into containers that can withstand temperatures and pressures of a retort chamber without undergoing significant and permanent distortion; said conveying means includes a conveyor and a plurality of trays conveyed on the conveyor, each of the plurality of trays having a plurality of holes therethrough in which the preventing means are placed; and said preventing means include means for suspending the plastic blanks thereacross.