Patent ID: 7003934
Filing Date: 2006-02-28
Classification: B29C,B29L,B65B

Abstract:
1. A heat-sealing device which transversely seals a tube shaped packaging material filled up with liquid food to form a seal zone of the tube shaped packaging material through softening or melting of plastic material forming a part of the tube shaped packaging material, comprising: a seal jaw and a counter jaw positioned in opposition to one another, the seal jaw including means for effecting softening or melting of the plastic material forming a part of the tube shaped packaging material, the seal jaw and the counter jaw both including an operation surface that faces and contacts the seal zone during transverse sealing under a liquid surface of the liquid food, the operation surface of the seal jaw being a flat surface across its entire extent, the seal jaw heating the packaging material to soften or melt the plastic material so that the seal zone is coextensive with the flat operation surface of the seal jaw, the operation surface of the counter jaw being formed with at least two raised ridges or at least two chevron-shaped elements to remove seal prevention impurity including the liquid food which may remain in the seal zone, or to mix the seal prevention impurity with the softened or melted plastic material.