Patent ID: 9021770
Filing Date: 2015-05-05
Classification: B29C,B29L,B65B

Abstract:
1. A sealing station in a thermoforming machine for sealing a cover sheet to a bottom sheet having pocket-like depressions to hold products, the sealing station comprising: a first mold and a second mold, the second mold comprising cavities to accept the pocket-like depressions in the bottom sheet; wherein said first and second molds are operable between an opened state and a closed sealing state in which a bottom surface of the first mold presses the cover sheet onto the bottom sheet resting on a top surface of the second mold, and heat of the first mold is transferred to the cover sheet, and thereby a sealing operation is carried out by partial welding of the cover sheet onto the bottom sheet; and a vent system, which comprises an inlet channel and an outlet channel in an area of each of the cavities, wherein a vent space is formed between each depression in the bottom sheet and each cavity, wherein, in the closed sealing state of the first and second molds, said inlet channel and said outlet channel are in communication with the vent space, and wherein in the closed sealing state air entering through the respective inlet channel during the sealing operation passes over the depression in the bottom sheet in the vent space and escapes through the outlet channel.