Fiber can with reinforcing crimped metal closure

A can comprising:

• a laminated fiber can body having a gas-tight fusible lining, an end wall shutting off one end of said body, the end wall being in the form of a metal plate with a peripheral crimping lip rolled together with a captured portion of the fiber can body to form an overlapped joint and a metal structural reinforcing ring at said one end of the fiber body, a partly metallic cover on the opposite end of the can body, said cover being formed as a rigid cover member having a peripheral crimping lip that is rolled outwardly together with a captured portion of the fiber can body at the opposite end into an overlapped joint between the rigid cover member and said opposite end of the can body, the rolled crimping lip and captured portion of the fiber can body together providing a structural reinforcing ring at said opposite end of the fiber body to withstand stresses developed at the joint and adjacent areas of the fiber body by pressure differences between the inside and outside of the can, said cover member having on its inner side a fusible coating that has an affinity for and is brought into sealing contact with the lining of the body within the overlapped reinforcing joint to form a gas-tight seal, said rigid cover member forming the structural reinforcing ring for the fiber body having an opening and a flexible covering diaphragm fixed in position over said opening, said covering diaphragm being adapted to undergo a change in form when a pressure difference comes into existence between the inside and outside of the can after the sealing thereof whereby the pressure difference is accommodated without developing significant strain at the crimped and sealed joints between the cover member, the metal end wall, and the fiber body.