Sack and method and device for producing sacks

Method for the production of sacks from tubular pieces (1) which include plastic material in which

• at least at one end area a bottom rectangle (2) is laid around a fold line (3) to form triangular pockets (6, 7), where said bottom rectangle comprises flaps (4, 5),
• parts of the flaps (4, 5) of the bottom rectangle (2) are folded back, and
• a bottom cover sheet (21) is applied at least to areas of the flaps (4, 5) of the bottom rectangle (2) and/or to areas (6, 7) of the triangular pockets and connected to them,
• a bottom cover sheet (21) is used which includes at least in part air-permeable material
• characterized in that
• a bottom cover sheet (21) is used which includes at least in part air-permeable material.
• that bottom cover sheet (21) comprises at least two layers of which one layer includes air-permeable material,
• that the first layer facing the flaps (4, 5) and/or triangular pockets (6, 7) consists of air-permeable material and in it perforations (13) are introduced,
• that the second layer includes air-permeable material and is applied to the first layer and is connected to it, and
• that for the connection connecting seams are used by which the perforations (13) are completely encircled.

Sack (1) which includes plastic material and which has the following features:

• a tubular body,
• a bottom folded at least at one end of the tubular body, said bottom comprising triangular pockets (6, 7) and those triangular pockets (6, 7) at least in part overlapping flaps (4, 5), and
• a bottom cover sheet (21) with which the bottom is covered where the bottom cover sheet (21) is applied at least to areas of the flaps (4, 5) and/or areas of the triangular pockets (6, 7) and connected to them,
• characterized in that
• the bottom cover sheet (21) includes at least in part air-permeable material.

Device for the production of bottom cover sheet material for use in a method according to claim 1 comprising:

• a take-off device (43) for taking off a first web including plastic,
• a perforation-introducing mechanism for introducing perforations into the first web,
• a second take-off mechanism (43) for taking off a second web which includes air-permeable material,
• a consolidation unit (38) with which the first web and the second web can be consolidated so that both aforementioned webs form a bottom cover sheet web.

Device for the production of bottom cover sheet material for use for sacks according to claim 12 comprising:

• a take-off device (43) for taking off a first web including plastic,
• a perforation-introducing mechanism for introducing perforations into the first web,
• a second take-off mechanism (43) for taking off a second web which includes air-permeable material,
• a consolidation unit (38) with which the first web and the second web can be consolidated so that both aforementioned webs form a bottom cover sheet web.