Envelopes include a cover for covering and isolating a closure sealing element on the envelope before the envelope is loaded and sealed. The cover can be formed as part of an adjacent wall of the envelope, and can be separated from the wall by a cut or a line or weakness between the cover and the wall.

A sealing device includes a frame member having an opening portion, an engaging portion with which a first portion of the bag-shaped film body is engaged, and a heater unit; a moving member having an attaching portion to which a second portion of the bag-shaped film body is attached and a heater receiving portion; and a handle member that is slidably inserted in the frame member and coupled to the moving member. The moving member is arranged so as to be movable in the opening portion toward the engaging portion, and the heater unit and the heater receiving portion are configured to clamp the bag-shaped film body and heat and seal it in a state in which the moving member is moved to the vicinity of the engaging portion by the handle member.

A sealing device includes a frame member having an opening portion, an engaging portion with which a first portion of the bag-shaped film body is engaged, and a heater unit; a moving member having an attaching portion to which a second portion of the bag-shaped film body is attached and a heater receiving portion; and a handle member that is slidably inserted in the frame member and coupled to the moving member. The moving member is arranged so as to be movable in the opening portion toward the engaging portion, and the heater unit and the heater receiving portion are configured to clamp the bag-shaped film body and heat and seal it in a state in which the moving member is moved to the vicinity of the engaging portion by the handle member.

A sealing device includes a frame member having an opening portion, an engaging portion with which a first portion of the bag-shaped film body is engaged, and a heater unit; a moving member having an attaching portion to which a second portion of the bag-shaped film body is attached and a heater receiving portion; and a handle member that is slidably inserted in the frame member and coupled to the moving member. The moving member is arranged so as to be movable in the opening portion toward the engaging portion, and the heater unit and the heater receiving portion are configured to clamp the bag-shaped film body and heat and seal it in a state in which the moving member is moved to the vicinity of the engaging portion by the handle member.

A sealing device includes a frame member having an opening portion, an engaging portion with which a first portion of the bag-shaped film body is engaged, and a heater unit; a moving member having an attaching portion to which a second portion of the bag-shaped film body is attached and a heater receiving portion; and a handle member that is slidably inserted in the frame member and coupled to the moving member. The moving member is arranged so as to be movable in the opening portion toward the engaging portion, and the heater unit and the heater receiving portion are configured to clamp the bag-shaped film body and heat and seal it in a state in which the moving member is moved to the vicinity of the engaging portion by the handle member.

Multilayer films are disclosed. The multilayer film may include a core layer and a heat seal layer where the heat seal lay comprises a polypropylene copolymer and a polyethylene copolymer. The polypropylene copolymer of the heat seal layer has specific properties such as ethylene content and iCCD elution profile to contribute to the desirable properties of the film. The multilayer film can form effective heat seals, even when in contact with heated contents. The multilayer film can be formed into a bag where the bag is suitable for carrying hot or heated contents.

Multilayer films are disclosed. The multilayer film may include a core layer and a heat seal layer where the heat seal lay comprises a polypropylene copolymer and a polyethylene copolymer. The polypropylene copolymer of the heat seal layer has specific properties such as ethylene content and iCCD elution profile to contribute to the desirable properties of the film. The multilayer film can form effective heat seals, even when in contact with heated contents. The multilayer film can be formed into a bag where the bag is suitable for carrying hot or heated contents.