Patent ID: 6648636
Filing Date: 2003-11-18
Classification: B29B,B29C,B29L,B31B,B65B

Abstract:
A heating device for heat-sealing containers by heating an end forming portion of a tubular container having a rectangular to square cross section, the end forming portion having four generally quadrilateral first to fourth panels continuous with one another and each having a heating region to be heated on an inner surface thereof,the heating device having a hot air nozzle in the form of a bottomed tube and fittable into the container end forming portion for heating an inner surface of the container, the nozzle having four side walls continuous with one another and corresponding to the first to fourth panels respectively, at least one of the side walls being provided with a hot air discharge portion having orifices and to be opposed to the heating region of the corresponding panel and with a hot air nondischarge portion other than the discharge portion, the hot air nondischarge portion being at least partly provided with a hot air escape portion.