a device and method are disclosed for forming air filled cushions . the device includes a drive mechanism to move inflatable tubing through the apparatus , and an injector , optionally including an outlet , located continuously within , or within a portion of , the tubing . this arrangement can permit the formation of air filled cushions in a continuous stream . also disclosed is a roll of plastic tubing that is sealed transversely at a succession of intervals , with each pair of seals stopping just short of a longitudinal center line of the tubing . such tubing might be used in conjunction with the apparatus , the central gap between the seals allowing passage of the injector .