The invention relates to a method for forming at least one bottom on a hose piece (20), which comprises plastic material, wherein at least one end of the hose piece is pulled open along at least one first folding edge (21), a bottom rectangle (22) and triangular pockets (23) thus being formed; wherein side tabs (25, 26) of the bottom rectangle are folded back along two folding edges (24) spaced apart from the first folding edge in order to close the bottom, wherein the two side tabs then contact each other, and wherein a bottom cover sheet (31) is applied to the bottom and is connected to the side tabs and at least one triangular pocket by application of heat or by means of glue. The surfaces of the side tabs that come into contact and the triangular pockets are connected to each other at least in the region of the two folding edges, a connection (32) thus being formed.

In order to provide an apparatus for successively making plastic bags each of which includes panel portions and a bottom gusset portion, in a way different from the prior art, upper and lower webs of panel material are superposed on each other and fed longitudinally thereof. A web of bottom gusset material is supplied to one of the webs of panel material to be superposed on the outer surface thereof, the web of bottom gusset material having opposite side edges one of which extends along ones of the opposite side edges of the webs of panel material. The web of bottom gusset material and the other web of panel material are temporarily fixed to each other at ones of the opposite side edges thereof after the webs of panel material are superposed and the web of bottom gusset material is supplied. One of the webs or the other web of panel material and the web of bottom gusset material are then guided so that one of the webs or the other web of panel material can be folded at a position adjacent to ones of the opposite side edges of the webs of panel material when the webs of panel material are fed. The web of bottom gusset material is combined with the webs of panel material. The panel portions are formed by the webs of panel material while the bottom gusset portion is formed by the web of bottom gusset material.

A female belt-shaped base is attached to a bag body at a region from a female hook to a first end near an open end of the bag body and to a second end near a housing space. A male belt-shaped base is attached to the bag body only in a bonding region without being attached at a region from a position where an engagement portion is continuously attached to a first end near the open end of the bag body.

A bag making apparatus and a bag making method make bags. The bag has a first panel part and a first flap part formed by folding a first sheet part, and a second panel part and a second flap part formed by folding a second sheet part. The first and second panel parts face each other. The first and second flap parts are interposed between the first and second panel parts and face each other. An open edge is formed by folded edges of the first and second sheet parts. The bag further comprises adhesive located between the open edge and the engagement tool, interposed between the first and second flap parts and extending across the widths of the first and second sheet parts to peelably adhere the first and second flap parts to each other. Alternatively, the second sheet part may only consists of the second panel part.

A rotary-type film folding machine comprises a feeding mechanism providing a tubular material for a folding mechanism in an axial direction, with a first driving mechanism driving the feeding mechanism to operate; a folding mechanism folding the tubular material delivered by the feeding mechanism, with a second driving mechanism driving the rotation of an outer sheath of the folding mechanism; a pressing mechanism pressing the tubular material folded by the folding mechanism, with a third driving mechanism driving the rotation of a first inner rotor for rotating the pressing mechanism and the folding mechanism; said pressing mechanism being driven by a fourth driving mechanism to move up and down; and the operations of the first, second, third and fourth driving mechanisms are controlled by a controller.

The product efficiency of bags each with an end face part is increased. A panel webs is guided to be divided along a line of weakness of the panel web and to be folded along division edges of the panel web. This guiding of the first panel and temporary sealed sections cause a side gusset to be cut open along a line of weakness of the side gusset such that open surfaces are formed. After the forming of the open surfaces, an end face web is supplied to be superposed on folded parts of the panel web and the open surfaces of the side gusset.

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 female belt-shaped base is attached to a bag body at a region from a female hook to a first end near an open end of the bag body and to a second end near a housing space. A male belt-shaped base is attached to the bag body only in a bonding region without being attached at a region from a position where an engagement portion is continuously attached to a first end near the open end of the bag body.

Packaging machine that includes a frame, a feed module configured to supply a film, a fold forming module configured to receive the film and for generating at least one longitudinal fold in said film, actuation means with a first actuator to cause the movement of the feed module with respect to the frame, and with a second actuator for moving the forming module with respect to the feed module. A control unit is configured to cause, while the film is being supplied, the first actuator to move at least the feed module with respect to the frame and the second actuator to move the forming module at least with respect to the feed module.