초록 ▼

Sealed packages of foodstuffs which are biological materials, particularly fruit, are vented by a temperature-sensitive control unit. The control unit covers an aperture in a wall of the package. The control unit includes a barrier member which is secured over the aperture by a layer of temperature

Sealed packages of foodstuffs which are biological materials, particularly fruit, are vented by a temperature-sensitive control unit. The control unit covers an aperture in a wall of the package. The control unit includes a barrier member which is secured over the aperture by a layer of temperature sensitive adhesive, and a force member which lifts the barrier member away from the aperture when an increase in temperature weakens the adhesive. The force member is preferably elastically deformed.

대표청구항 ▼

[What is claimed is:] [1.](A) a sealed container which defines an interior space, and(B) a foodstuff which is a biological material within the interior space;the sealed container comprising(1) walls which(a) define the interior space, and(b) contain a window through which gases can pass into or out

[What is claimed is:] [1.](A) a sealed container which defines an interior space, and(B) a foodstuff which is a biological material within the interior space;the sealed container comprising(1) walls which(a) define the interior space, and(b) contain a window through which gases can pass into or out of the interior space; and(2) a temperature-sensitive cover unit which comprises(a) a base member which is secured to a wall of the container,(b) a barrier member which is secured over the window and reduces the rate at which gases pass through the window,(c) a layer of an adhesive which secures the barrier member over the window by adhesive forces which decrease if the layer is heated from the first temperature to an elevated temperature, and(d) an elastically deformed force member which exerts elastic recovery forces on the barrier member which (i) tend to move the barrier member so that it uncovers the window, (ii) at the first temperature are insufficient to overcome the adhesive forces which secure the barrier member over the window, and (iii), when the cover unit is heated from the first temperature to the elevated temperature, are sufficient to overcome the adhesive forces which secure the barrier member over the window, so that the force member recovers elastically and causes the barrier member to move so that it uncovers at least part of the window, thereby increasing the rate at which gases pass through the window.