Packaging containers and packaging films used therein

Abstract

To provide a packaging film capable of surely passing steam therethrough when the temperature in a packaging container rises, and to provide a packaging container with the packaging film.SOLUTION: A packaging container 1 comprises a container 2 for storing contents, and a lid material film 3 joined to the container at a joining region 231 continuously running around the circumference of one surface of the container 2, thereby sealing a gap between the film and the container 2 in a state where the contents are stored. The lid material film 3 comprises a sealant layer 32 bonded to the container 2 and a weak seal layer 34 laminated on part of a surface of the sealant layer 32 facing the container 2. The weak seal layer 34 is formed of a weak bonding force composition in which at least part thereof constitutes part of the joining region 231 and bonding force of the composition to the container 2 is weaker than that of the sealant layer 32 to the container 2.SELECTED DRAWING: Figure 1

Claims

1. The packaging comprises a container for holding contents, and a packaging film that is joined to the container at a continuous joining region around one side of the container, thereby sealing the space between the container and the contents while the contents are contained within. The aforementioned packaging film is A sealant layer that is joined to the aforementioned containment, The sealant layer comprises a weak seal layer laminated on a part of the surface facing the containment, The weak seal layer is formed of a weak bonding composition in which at least a portion constitutes a portion of the bonding region and the bonding force to the housing is weaker than the bonding force of the sealant layer to the housing. The weak bonding composition contains a lipophilic composition that absorbs oil generated from the contents inside the container, The lipophilic composition is contained in an amount of 2% by weight or more and 10% by weight or less relative to 100% by weight of the weak bonding composition. packaging container.

2. The weak bonding composition contains a hydrophilic composition that absorbs moisture generated from the contents inside the container, and silica particles as the lipophilic composition. The hydrophilic composition is starch or a polymeric superabsorbent. The packaging container according to claim 1.

3. The hydrophilic composition and the lipophilic composition are present as particles in the weak seal layer. The packaging container according to claim 2.

4. The container has a concave container portion for containing the contents and a flange portion formed along the opening of the container portion. The flange portion has one or more curved portions, The weak seal layer is provided on at least a portion of the surface of the sealant layer at the position where it is joined to the curved portion. The packaging container according to claim 1, 2, or 3.

5. The sealant layer, The sealant layer comprises a weak seal layer laminated on a part of the surface of the sealant layer, The weak seal layer is formed of a weak bonding force composition that has a weaker bonding force to the object to be bonded than the sealant layer. The aforementioned weak bonding composition contains a lipophilic composition that absorbs oil, The lipophilic composition is contained in an amount of 2% by weight or more and 10% by weight or less relative to 100% by weight of the weak bonding composition. Packaging film.

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