PACKAGING BAG FOR HEAT PROCESSING AND METHOD OF MANUFACTURING PACKAGING BAG FOR HEAT PROCESSING

To provide a packaging bag for heat processing in which contents do not leak by ventilating steam from a back pasting portion securely when the heat processing is performed by microwave oven etc., and lowering of costs is attempted.SOLUTION: A packaging bag for heat processing of this invention is formed by a sheet member 1 which comprises an outside sealant layer that is layered on an outer face to a base member and enables heat sealing, and an inside sealant layer which is layered on an inner face to the base member and enables the heat sealing, and is formed in a pillow form having a back pasting portion 8 in which both side edges of the inside sealant layer are welded. At both ends of the sheet member 1, an end welding portion 10 in which the inside sealant layers are welded mutually and the outside sealant layers are welded mutually in a state that the welded portion is folded back once or more is formed.SELECTED DRAWING: Figure 4 【課題】電子レンジ等によって加熱処理を行なう場合、背貼り部から確実に通蒸して中身が漏れないようにすると共に、低コスト化が図れる加熱処理包装袋を提供する。【解決手段】本発明の加熱処理包装袋は、基材に対して外面に積層され熱シール可能な外側シーラント層と、基材に対して内面に積層され熱シール可能な内側シーラント層と、を備えたシート部材１によって形成され、内側シーラント層の両側縁を溶着した背貼り部８を有するピロー型に形成される。シート部材１の両端は、内側シーラント層同士が溶着されるとともに、溶着された部分を１回以上折り返した状態で外側シーラント層同士が溶着された端部溶着部１０が形成されている。【選択図】 図４