Packaging bag, sealing bar, and production method for packaging bag
AssigneeKyoraku Co., Ltd.
InventorsHirofumi Sakonuma, Supparak Uraivorn
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Abstract
The present invention provides a packaging bag that can suppress the formation of an opening at a portion other than the vapor release seal portion. According to the present invention, provided is a packaging bag made of a film heat-sealed at a seal portion, wherein the seal portion includes a vapor release seal portion configured to form a vapor flow path as an internal pressure increases, the vapor release seal portion has a curved shape curved toward an inner direction of the packaging bag, the vapor release seal portion includes a first region including a distal end of the curved shape and a second region adjacent to the first region, and sealing strength in the first region is higher than sealing strength in the second region.
Claims6
A packaging bag made of a film heat-sealed at a seal portion,
- wherein the seal portion comprises a vapor release seal portion configured to form a vapor flow path as an internal pressure increases,
- the vapor release seal portion has a curved shape curved toward an inner direction of the packaging bag,
- the vapor release seal portion includes a first region including a distal end of the curved shape and a second region adjacent to the first region, and
- a sealing strength in the first region is higher than a sealing strength in the second region,
- wherein the vapor release seal portion comprises an inner region and an outer region configured by dividing the vapor release seal portion at a boundary line located between an inner edge and an outer edge of the vapor release seal portion, and
- a sealing strength in the inner region is higher than a sealing strength in the outer region;
- and
- wherein the inner region is toward the inner direction of the packaging bag.
A packaging bag made of a film heat-sealed at a seal portion, wherein
- the seal portion comprises a vapor release seal portion configured to form a vapor flow path as an internal pressure increases,
- the vapor release seal portion has a curved shape curved toward an inner direction of the packaging bag,
- the vapor release seal portion includes a first region including a distal end of the curved shape and a second region adjacent to the first region,
- a sealing strength in the first region is higher than a sealing strength in the second region,
- the first region includes a base portion and a protruding portion,
- the protruding portion protrudes from the base portion toward the inner direction of the packaging bag,
- a step portion is provided on an inner edge of the base portion so that the step portion provides a step between the second region and the protruding portion,
- a weakly sealed region is provided at a tip of the protruding portion, and
- the seal strength of the weakly sealed region is weaker than that of other regions of the protruding portion.
Dependencies are inferred from the claim text.