# US 2013/0156352 A1 · Sack and method and device for producing sacks > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2013/0156352 A1 - Document ID: US20130156352A1 - Status: Published application - Kind: A1 - Application number: 13/818,776 - Filed: 2011-08-15 - Published: 2013-06-20 - Earliest claimed: 2010-08-25 - Assignees: Windmoeller & Hoelscher KG - Inventors: Uwe Koehn - Web page: https://patentgrep.com/patent/US20130156352A1 ## CPC - B65D 33/1658: {Elements for flattening or folding the mouth portion (B65D33/30 takes precedence)} - B31B 70/00: Making flexible containers, e.g. envelopes or bags - B65D 31/08: {with block bottoms} - B65D 33/01: Ventilation or drainage of bags - B65D 33/1691: {using adhesive applied to attached closure elements} - B31B 70/81: Forming or attaching accessories, e.g. opening devices, closures or tear strings - B31B 2150/00: Flexible containers made from sheets or blanks, e.g. from flattened tubes - B31B 2150/001: {with square or cross bottom} - B31B 2150/003: {made from tubular sheets} - B31B 2160/10: rectangular and flat, i.e. without structural provision for thickness of contents - B31B 2160/20: with structural provision for thickness of contents - B31B 2170/20: having multi-layered walls, e.g. laminated or lined - B65D: CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES - B31B: MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER (making wound articles, e.g. wound tubes, B31C; combined making and filling B65B) ## Abstract The invention concerns a 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) (6, 7), where said bottom rectangle comprises flaps (4, 5) (4, 5), parts of the flaps (4, 5) (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. According to the invention a bottom rectangle (21) is used which includes at least in part air-permeable material. ## Claims ### Claim at position 1 1-27. (canceled) ### Claim 28 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. ### Claim 29 (depends on 28) Method according to claim 28, characterized in that the flaps (4, 5) are folded in such a manner that the edges of the flaps (4, 5) and the edges of the triangular pockets (6, 7) and/or the edge of the valve patch encircle an opening (11) through which the interior of the sack is accessible. ### Claim 30 (depends on 28) Method according to claim 28, characterized in that each surface encircled by the adhesive seams is at least twice as large as the surface of the corresponding perforation (13). ### Claim 31 (depends on 28) Method according to claim 28, characterized in that to the second layer a third layer is applied and is connected to the first and/or to the second layer. ### Claim 32 (depends on 31) Method according to claim 31, characterized in that into the third layer, at least in the vicinity of the perforations (13) of the first layer, cuts (26) are introduced. ### Claim 33 (depends on 32) Method according to claim 32, characterized in that the cuts are made in the form of a circular arc. ### Claim 34 (depends on 33) Method according to claim 33, characterized in that a seamlessly produced tube is used which comprises a circular fabric of extended plastic bands where the circular fabric is coated with a plastic. ### Claim 35 (depends on 28) Method according to claim 28, characterized in that the bottom cover sheet (21) is fastened to the bottom area of the sack by a heat-induced joining process. ### Claim 36 (depends on 35) Method according to claim 35, characterized in that before the fastening of the bottom cover sheet (21) on the bottom area of the sack to the areas of a side of a bottom cover sheet (21), specifically the side facing the bottom of the sack, which cover the opening (11), a separating agent is applied. ### Claim 37 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. ### Claim 38 (depends on 37) Sack (1) according to claim 37, characterized in that the flaps (4, 5) are folded in such a manner that the edges of the flaps (4, 5) and the edges of the triangular pockets (6, 7) and/or the edge of the valve patch encircle an opening (11) through which the interior of the sack (1) is accessible. ### Claim 39 (depends on 37) Sack (1) according to claim 37, characterized in that the bottom cover sheet (21) comprises at least two layers of which one includes air-permeable material. ### Claim 40 (depends on 39) Sack (1) according to claim 39, characterized in that the first layer facing the flaps (4, 5) or the triangular pockets (6, 7) includes air-permeable material and perforations such as perhaps punch-outs. ### Claim 41 (depends on 39) Sack (1) according to claim 39, characterized in that the second layer is air-permeable and is glued to the first layer. ### Claim 42 (depends on 39) Sack (1) according to claim 39, characterized in that the second layer is glued to the first layer by means of adhesive seams by which the perforations (13) are completely encircled. ### Claim 43 (depends on 42) Sack (1) according to claim 42, characterized in that each surface encircled by the adhesive seams is at least twice as large as the surface of the corresponding perforation (13). ### Claim 44 (depends on 39) Sack (1) according to claim 39, characterized in that on the second layer a third layer is applied and is connected to the first and/or to the second layer. ### Claim 45 (depends on 44) Sack (1) according to claim 44, characterized in that the third layer in the vicinity of the perforations (13) of the first layer comprises cuts (26). ### Claim 46 (depends on 1) 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. ### Claim 47 (depends on 46) Device according to claim 46, characterized in that an adhesive unit (36) for coating the first web with adhesive is provided. ### Claim 48 (depends on 46) Device according to claim 46, characterized in that a web-turning device is provided with which parts of the plastic web can be turned to cover the web which includes air-permeable material. ### Claim 49 (depends on 46) Device according to claim 46, characterized in that the take-up device (49) is provided with which the bottom cover sheet can be taken up. ### Claim 50 (depends on 47) Device for the production of sacks of tubular pieces (1) which include plastic material comprising: a transport mechanism (45) with which the tubular pieces can be transported to the processing stations (8, 9, 10, 11) in a transport direction (x) which runs transverse to the length (z) of the tubular pieces, a bottom-opening station (8) with which by rotating areas of at least one wall of the tubular piece around the bottom fold edges on at least one end of a tubular piece open end sections can be produced, a drawing station with which by rotating parts of walls and/or flaps (4, 5) around additional fold edges the open bottom rectangles (2) can be drawn up to from bottoms, a bottom cover sheet station with which bottom cover sheets (21) can be applied to the bottoms, characterized by a device for the production of bottom cover sheet material according to claim 47. ### Claim 51 (depends on 12) 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.