초록 ▼

A can has a film which is stretched on the inside of an end plate thereof so as to be deflectable in and out of contact with the end plate so that the can which has heated contents packed and sealed therein can be prevented from deformation caused as the contents cool down. The above-mentioned can i

A can has a film which is stretched on the inside of an end plate thereof so as to be deflectable in and out of contact with the end plate so that the can which has heated contents packed and sealed therein can be prevented from deformation caused as the contents cool down. The above-mentioned can is manufactured by overlaying the end plate and the film one on top of the other and then unitarily securing the end brim of the can body and the peripheral edge portion of the end plate to each other by double seaming, with the film disposed on the inside of the end plate.

대표청구항 ▼

In a can to be packed with heated contents, said can including a can body formed of a material having a relatively low pressure resistance and opposite first and second ends to be sealingly closed, the improvement comprising means for, upon cooling of the heated contents, preventing deformation of s

In a can to be packed with heated contents, said can including a can body formed of a material having a relatively low pressure resistance and opposite first and second ends to be sealingly closed, the improvement comprising means for, upon cooling of the heated contents, preventing deformation of said can body as a result of the generation therein of negative pressure, said preventing means comprising closure means for covering a first said end of said can body while absorbing said negative pressure, said closure means comprising: an imperforate end plate having a periphery sealingly secured to said can body and a nonplanar, nonperforated central portion, said end plate being formed of a material capable of being deformed inwardly; an imperforate flexible film member stretched across said can body inwardly of said end plate and having a periphery secured to said periphery of said end plate, said film member being formed of a material capable of inward deflection upon the generation within said can body of said negative pressure; and a predetermined sealed space maintained between said end plate and said film member and forming cushioning means for, upon initial inward deflection of said film member resulting from initial negative pressure within said can body due to initial cooling of contents therein, followed by inward deformation of said end plate, enabling further inward deflection of said film member to absorb further negative pressure generated within said can body due to further cooling of contents therein, without deformation of said can body.