Importance

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Abstract

A form, fill and seal machine packages products in a thermoplastic material which is formed into a tube and sealed with a measured amount of the product within. The transverse seals in the tube are formed in a cyclic operation by a pair of cooperating sealing heads. The heads clamp the tube walls together above and below a line of severance between two sequentially formed packages and weld the tube walls together along transverse sealing areas at each side of the line of severance. To heat the material to a fusing temperature, the one sealing head has a chamber from which hot gas is directed onto one side of a sealing area, and the other sealing head has an electrical heater for applying a thermal impulse of heat to the other side of the sealing area. The hot gas presses the thermoplastic material against the electrical heater and provides a 'free form' clamp for uniform sealing pressure. The two sources of heat at opposite sides of the sealing areas permit an increased rate of sealing and an increased cyclic rate of the machine.

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First Claim