Abstract: To provide a valve structure in which a valve sheet is not fused to outer sheets when heat-sealing to a sealed bag. The left and right sides of three valve constituting sheets are side-sealed, and opposed valve constituting sheets are brought into close contact with each other to restrict a fluid from moving. The inside and outside of a bag body are partitioned by a partition seal, the valve is disposed across the inside and outside of the bag body, and welded to the bag body by the partition seal. One of the opposed surfaces of the valve constituting sheets is formed of a non-weldable film that is not welded by welding of the side seals and the partition seal. The side seals become non-welded portions and side-entering preventive sealed portions that block flows of the fluid into the movement channel are provided continuously to the partition seal.

Abstract: A bag adapted to be changed from a predetermined larger size into a predetermined smaller size and vice versa, has a front, rear side and bottom panels and readily disengageable fasteners in predetermined positions on the panels so that by folding the panels, the smaller size bag can be realized by engaging the readily disconnectable fasteners.

Abstract: A tamper-evident reclosable plastic bag comprises first and second opposing panels, a zipper, a slider, and an end termination. The first and second opposing panels are fixedly connected to each other along a pair of sides and a bottom bridging the pair of sides. The zipper extends along a mouth formed opposite the bottom. The zipper includes a first track with a first profile and a second track with a second profile. The first and second profiles are releasably engageable to each other. The slider is slidably mounted to the zipper for movement between a closed position and an open position. The first and second profiles are engaged to each other while the slider is in the closed position. The first and second profiles are disengaged from each other in response to movement of the slider from the closed position to the open position. The end termination is near one end of the zipper adjacent to one of the pair of sides.

Abstract: The present invention relates to a multiple-use shipping bag comprising a wrapper which has a front wall (10) and a rear wall (12) of substantially opaque plastics material, and an opening for the introduction of material to be dispatched, wherein said front wall (10) has a cut-out which is in the form of an address window (34) and which is covered on the inside by means of a transparent layer (14), wherein said transparent layer (14) extends in the interior of the wrapper over at least the inside surface of the front wall (10) and is non-releasably connected to the front wall (10) in the region of the address window (34), and wherein a closure flap (20) adjoining said rear wall (12), for closing said opening, is provided in such a way that it can be introduced and inserted between said front wall (10) and said transparent layer (14).