EP2285722B1 - Bag machine and winder - Google Patents
Bag machine and winder Download PDFInfo
- Publication number
- EP2285722B1 EP2285722B1 EP09762949.7A EP09762949A EP2285722B1 EP 2285722 B1 EP2285722 B1 EP 2285722B1 EP 09762949 A EP09762949 A EP 09762949A EP 2285722 B1 EP2285722 B1 EP 2285722B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- film
- path
- infeed
- nip
- bags
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000004804 winding Methods 0.000 claims abstract description 48
- 238000000034 method Methods 0.000 claims abstract description 18
- 238000013459 approach Methods 0.000 claims abstract description 7
- 238000011144 upstream manufacturing Methods 0.000 claims description 7
- 238000007664 blowing Methods 0.000 claims 2
- 239000010408 film Substances 0.000 description 168
- 230000003068 static effect Effects 0.000 description 8
- 238000010586 diagram Methods 0.000 description 6
- 238000003482 Pinner synthesis reaction Methods 0.000 description 5
- 239000003292 glue Substances 0.000 description 4
- 229920006362 TeflonĀ® Polymers 0.000 description 2
- 230000001351 cycling effect Effects 0.000 description 2
- 239000004033 plastic Substances 0.000 description 2
- 229920003023 plastic Polymers 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 239000004831 Hot glue Substances 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000004026 adhesive bonding Methods 0.000 description 1
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
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- 239000011248 coating agent Substances 0.000 description 1
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- 238000010276 construction Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 229920001903 high density polyethylene Polymers 0.000 description 1
- 239000004700 high-density polyethylene Substances 0.000 description 1
- 239000012943 hotmelt Substances 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 229920000098 polyolefin Polymers 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 230000002441 reversible effect Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
Images
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H29/00—Delivering or advancing articles from machines; Advancing articles to or into piles
- B65H29/66—Advancing articles in overlapping streams
- B65H29/6609—Advancing articles in overlapping streams forming an overlapping stream
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31B70/00—Making flexible containers, e.g. envelopes or bags
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H19/00—Changing the web roll
- B65H19/22—Changing the web roll in winding mechanisms or in connection with winding operations
- B65H19/2276—The web roll being driven by a winding mechanism of the coreless type
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H29/00—Delivering or advancing articles from machines; Advancing articles to or into piles
- B65H29/006—Winding articles into rolls
- B65H29/008—Winding single articles into single rolls
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H29/00—Delivering or advancing articles from machines; Advancing articles to or into piles
- B65H29/58—Article switches or diverters
- B65H29/60—Article switches or diverters diverting the stream into alternative paths
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31B2155/00—Flexible containers made from webs
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31B2160/00—Shape of flexible containers
- B31B2160/10—Shape of flexible containers rectangular and flat, i.e. without structural provision for thickness of contents
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31B70/00—Making flexible containers, e.g. envelopes or bags
- B31B70/02—Feeding or positioning sheets, blanks or webs
- B31B70/022—Holders for feeding or positioning sheets or webs
- B31B70/024—Rotating holders, e.g. star wheels, drums
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31B70/00—Making flexible containers, e.g. envelopes or bags
- B31B70/74—Auxiliary operations
- B31B70/92—Delivering
- B31B70/94—Delivering singly or in succession
- B31B70/942—Delivering singly or in succession by winding up
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H2301/00—Handling processes for sheets or webs
- B65H2301/50—Auxiliary process performed during handling process
- B65H2301/51—Modifying a characteristic of handled material
- B65H2301/515—Cutting handled material
- B65H2301/5151—Cutting handled material transversally to feeding direction
- B65H2301/51514—Breaking; Bursting; Tearing, i.e. cutting without cutting member
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H2404/00—Parts for transporting or guiding the handled material
- B65H2404/10—Rollers
- B65H2404/13—Details of longitudinal profile
- B65H2404/131—Details of longitudinal profile shape
- B65H2404/1316—Details of longitudinal profile shape stepped or grooved
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H2406/00—Means using fluid
- B65H2406/10—Means using fluid made only for exhausting gaseous medium
- B65H2406/12—Means using fluid made only for exhausting gaseous medium producing gas blast
- B65H2406/122—Nozzles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H2513/00—Dynamic entities; Timing aspects
- B65H2513/10—Speed
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H2701/00—Handled material; Storage means
- B65H2701/10—Handled articles or webs
- B65H2701/19—Specific article or web
- B65H2701/191—Bags, sachets and pouches or the like
Definitions
- bag machines used for making bags from a continuous film, such as a polyolefin film.
- Commercially available bag machines, winders, and folders include CMDĀ® Models 3113, 1100 series, 1500, 4013RO series, and other machines described at www.cmd-corp.com.
- Examples of patented prior art bag machines include US Patents 6117058 , 4934993 , 5518559 , 5587032 and 4642084 and US Patent Publication 20060084559 .
- the film may be a single film, or folded film, or a (flat) tube. Bags are formed by placing seals on the film in desired locations. The seals may form the bottom/top and/or sides of the bag. Perforations may be included denoting sides or top/bottom of adjacent bags. Other operations may be performed such as separating and/or folding.
- Prior art rotary bag machine 100 continuously processes a web or film 201 using a dancer assembly 203, a pair of drum-in rolls 205 and 206 (203-206 are part of an input section), a sealing drum 208, a pair of drum-out rolls 210 and 211, a sealing blanket 213, a pair of knife-in rolls 215 and 216, a knife 218 (which could be any other web processing device such as a perforator, knife, die cutter, punching station, or folding station), a pair of knife-out rolls 219 and 220 (210-220 are part of an output section), and a controller 221.
- Input section or unwind section includes the portion of a bag machine where the web is received, such as an unwind and a dancer assembly.
- Output section includes assemblies that act on a web downstream of the seals being formed, such as perforators, winders, folders, etc.
- Drum 208 includes a plurality of seal bars 209.
- the seals bars are heated and create the seals forming the bags from web 201- Web 201 is held against drum 208 (and the seals bars) by a TeflonĀ® coated blanket.
- End to end bags are formed with one seal from the drum, and side to side bags are formed with a pair of seals.
- the drum diameter may be adjusted and/or less than all of the seal bars turned on to determine the distance between seals, and hence bag size.
- rotary motion machines register a downstream rotary knife to perforate between two seals, or beside a seal.
- the prior art of Figure 1 provides that after web 201 leaves drum 208 it is directed to rotary knife 218, which creates a perforation between bags, or could separate adjoining bags.
- the perforation is placed close to the single seal such that when the bags are separated, the perforation and the perforated end is the top of one bag, and the seal is the bottom of the adjoining bag.
- Controller 221 is connected to the various components to control speed, position, etc. Sensors may be used to sense print on the web to form the seals and/or register the perforation (place it in the correct location with respect) to the seal. Also, sensors may detect seals to try and create the perforation in the correct location.
- Prior art winders include US Patents 4,667,890 ; 4,695,005 ; 6186436 ; and 5899403 .
- Prior art winders either have a rotating turret with multiple spindles or a single fixed spindle and web stopper. A desired number of bags is wound about the spindle, forming the rolL The roll is then pushed off, often using a push off palm. The roll may be paper banded, and unacceptable rolls may be culled.
- the prior art describes various ways to properly direct the leading end of the roll to the desired spindle, and to control the winding.
- a winder with stationary spindles that operates at higher speeds than prior art single spindle systems is desirable.
- a winder can be used with pneumatic devices, and can receive air connections easily.
- US2008/0627279 discloses a method and apparatus for making and winding bags.
- the bag machine includes an unwind section, a forming section, and a winder.
- the winder has an infeed nip and two spindles. Each spindle is located along a respective one of two alternative film paths.
- the spindles can be fixed position spindles and the alternative film paths can be predominantly downward.
- An over speed nip may be provided between the infeed nip and the alternative film paths to separate rolls or to separate all bags.
- An overlapper can be included. Rods that travel in an elliptical orbit, and/or air nozzles can be part of the overlapper. Air nozzles can also be used to direct the film to the appropriate alternative path.
- Conveyor belts along the alternative film paths can be used to guide the film.
- Static pinners can be used to help bold the bags to the conveyor, or the last bag to the roll.
- Pop-up fingers and air horns can help start the roll on a spindle.
- Paper banders can be use, as can pneumatic devices.
- a push off device that scrape the spindles over substantially 360 degrees can be used.
- GB1431350 discloses an apparatus for continuously winding a plastics lay-flat tube, composed of interconnected plastics bags comprises a pair of tube feed rollers followed by a loop forming store and a winding station which includes a pair of automatically changeable and alternately operable winding mandrels each including axially retractable rods respectively, to define apertures enabling the tube to pass therethrough, the mandrels being driven at a lower speed during winding and at a higher speed during core change to sever the tube at a location corresponding to a line of weakness between adjacent bags.
- a carriage supporting a loop forming roller is adjusted such in conjunction with roller supporting lever which rests on a stop, that a line of weakness is disposed below a spark gap and a further line of weakness is disposed intermediate the mandrels, whereupon the winding is started by, e.g. the drive driving the mandrel at a lower speed.
- the spark gap produces a count which is applied to a counter in turn supplying an output signal to a controller for the mandrel drives when a predetermmed count is reached.
- the controller stops the drive and causes the drive of mandrel to rotate the latter at a higher speed in consequence of which the tube is withdrawn from the store, which when depleted operates a switch to apply a signal to the controller for lowering the mandrel driving speed. Meanwhile, during the higher mandrel speed and removal of tube from the store, the tube has been attached to the mandrel and severed from the lay-flat tube wound on the mandrel.
- US2002/030135 discloses an apparatus and a method of producing a roll of bags, a bag feeding device is arranged to feed bags one by one to a winding device.
- the winding device includes a rotating spindle which is arranged to engage with each bag separately to wind the bag on it, so as to build a roll of bags in which the bags are unconnected to one another yet firmly held together.
- the winding device comprises at least two separate winding stations, each winding station being connected to one or more bag feeding devices; and a switch that is arranged upstream of a bag feeding device to direct the bags from one winding station to the other when a roll of bags has been completed in one of the winding stations.
- a winder for a bag machine or sheet machine as set out in claim 1.
- the winder for the bag machine may comprise an infeed nip and two spindles. Each spindle is located along one of two alternative film paths.
- the method of winding bags from a continuous film may include feeding the film into a winder and alternately directing the film along a alternative paths to one of two spindles. The alternations occur after a plurality of bags, such as a roll, are wound.
- the bag machine may include an unwind section, a forming section, and a winder.
- the winder includes an infeed nip and two spindles, each located along a respective alternative film path.
- the spindles are fixed position spindles in one alternative embodiment.
- the alternative film paths are predominantly downward in other embodiments.
- An over speed nip may be provided between the infeed nip and the alternative film paths.
- the over speed nip operates in an intermittent mode and in an every bag mode, and/or has a user adjustable over speed, in various embodiments
- the winder includes an overlapper between the infeed nip and the alternative film paths, in other embodiments.
- the overlapper can include a plurality of rods moved in an orbit that intersects the film path in at least two locations.
- the orbit can be generally elliptical.
- the overlapper includes a plurality of air nozzles in other embodiments.
- the over speed nip has air nozzles disposed to direct the film to one alternative film path, and other air nozzles disposed to direct the film to the other alternative film path.
- the winder includes conveyor belts along the alternative film paths in other alternatives.
- the conveyor belts can pivot at an end closest the infeed nip.
- the winder includes static pinners along the alternative film paths, that can be bipolar, in various embodiments.
- the winder includes pop-up fingers disposed along the alternative film paths in other alternatives.
- the winder includes paper banders near the spindles in various embodiments.
- the winder is driven with pneumatic air in one embodiment.
- the winder includes push off devices that scrape the spindles over substantially 360 degrees in other alternatives.
- the winder for a bag or sheet machine may include an infeed nip, a film guide or guides and spindle or spindles.
- the film approaches the indeed nip by following the surface of an indeed roller for an arc of at least 10 degrees.
- the film path is then through the nip and toward the spindle.
- the film guide is disposed along the film path for at least the arc on which the film wraps the indeed roll, and further along the film path downstream of the infeed nip.
- the film guide is recessed in the infeed roller at least along the arc.
- the method of winding bags from a continuous film may include guiding the film with a first infeed roller and at least one film guide recessed in the first infeed roller, along the surface of the rirst infeed roller for an arc of at least 10 degrees. Then guiding the film with the film guide and roller to an infeed nip. Then guiding the film to at least one winding station and winding the bags.
- the film guide is stationary and touches the film along the arc according to one embodiment.
- the film guide is further recessed below the surface of the roll at the infeed nip according to another embodiment.
- the arc is at least 45, 60 and 90 degrees in various embodiments.
- the winder includes a second spindle, and each spindle is on an alternative film path in another embodiment.
- a rotatable brush is disposed at a location where the film path can follow either the alternative film path to direct the film to a selected path in another embodiment.
- An over speed nip is located on the film path downstream of the infeed nip and upstream of the brush and/or a source of air blow to the film from one side and/or the other side and diverts film from the film path to take up excess film for overlapping adjacent bags in other embodiments.
- the sources of air are located upstream of the rotatable brush and downstream of the over speed nip in another embodiment
- a finger/guide is disposed near the spindle or spindles to remove rejected bags in another embodiment.
- a second film guide is disposed on the opposite side of the film in another embodiment.
- a bander for the bag machine may include a conveyor for providing tape to a spindle and two sources of air.
- the tape approaches the spindle from a first direction and passes above the spindle, and wraps around a roll of bags wound about the spindle.
- One source of air is directed to support the tape as the tape approaches the spindle.
- the other source of air is directed to force the tape around the roll of bags as the tape passes over above the spindle, aiding the tape wrapping about the roll.
- the one source of air also supports the tape as it wraps about the roll of bags, thereby aiding the tape wrapping about the roll.
- the first source of air is mounted on an air horn disposed to be moved to and away from the spindle in an alternative embodiment.
- the present invention is described with respect to a winder that can be used with, or is part of, a prior art bag machine to make a roll of bags for easy packaging, transporting, dispensing, and use.
- the preferred embodiment is described with respect to a bag machine such as that shown in US Patent 6117058 , or available commercially as the CMDĀ® 1270 bag machine, or a modular bag machine.
- the invention is contemplated as a winder, a winder and separator, a winder, separator and overlapper, or an entire bag machine.
- Overlapper, as used herein, includes a device or section that overlaps succeeding bags.
- the bag machine prior to the winder is described below, since it can be the prior art machine described above. Other bag machines may be used as well.
- Over speed nip includes a nip wherein at least one driven roller has a circumferential speed greater than the speed of the film prior to the nip.
- the nip can operate in an every bag mode, or in an intermittent mode to separate bags only at the start/end of rolls. Every bag mode, as used herein, includes operating for every bag within a roll. Intermittent mode, as used herein, includes not operating for every bag within a roll, such as operating only at the beginning or end of a roll, or for a few bags within a roll. The bags can be overlapped in the every bag mode.
- a film divertor directs the film to one of two spindles.
- Each winding spindle takes turns winding film, which eliminates bottlenecks and allows for higher speeds, higher cycle speeds, and lower count rolls.
- the film is directed by the divertor along one of two alternative film paths to one of the two spindles or winding stations.
- Film path is the path film takes through the bag machine or winder, excepting any area where film is accumulated for winding.
- Alternative film path includes a path followed by the film or bags a portion of the time the winder is in use.
- the alternative paths are preferably predominantly downward, allowing rejected film or missed transfer film to be rejected to the floor in a convenient location.
- Predominantly downward includes more vertical (with gravity) than horizontal.
- the spindles are fixed position spindles.
- Fixed position spindles includes spindles that do not move from a location, such as in an orbit, but can rotate.
- the leading edge of the first bag of the next roll is directed along the other alternative path to the other spindle.
- the winder can wind immediately on the other spindle without moving the spindles, and without having to remove a roll before winding the next roll.
- Air can be used to direct the film as desired, and pop-up fingers and/or an air horn can be used to start the roll.
- Static pinning can be used to bold the bags to the spindle, and bipolar static pinning can be used to hold the tail of the last bag of a roll to the roll.
- Conveyors can be used to guide the film along the alternative paths, and the conveyor can pivot as the roll gets larger, to accommodate its growing diameter.
- a paper bander can be used and the drying time for the glue can be accommodated since the glue can dry while the other spindle is being used.
- a push off device can be used to remove rolls, and can scrape substantially 360 degrees around the circumference of the spindle since the spindles are fixed position spindles. Substantially 360 degrees, as used herein, includes over the entire circumference except for occasional small interruptions.
- Winder 200 may be downstream along the film path of bag machine 100 of Figure 1 .
- Many of the alternatives mentioned above are shown, although as stated above, all need not be included.
- Film 201 travels from perforator or knife 218 ( Figure 1 ) to an infeed nip defined between rolls 303 and 305 ( Figure 2 ), at least one of which is driven.
- the infeed nip draws or feeds the film into winder 200.
- Infeed nip can refer to the infeed for a machine or a section. Here it is used to refer too the infeed of the winder section.
- the preferred embodiment provides for a vertical feed of the web through the indeed nip. This allows the machine to be uni-handed with respect to an operator side, and can accommodate both left and right hand floor plans.
- Film 201 after leaving the infeed nip, is provided to an over speed nip defined between rolls 307 and 309, at least one of which is driven (Film 201 is provided to other stations directly, or indirectly after leaving the infeed nip in various embodiments).
- the over speed is servo driven and the over speed percent can be changed easily by the user for a wide perforation repeat distance, such as from 10" to 250" without changing parts.
- an intermittent mode it can run perforation-connected film and separate one of plurality of bags from its succeeding bag by running over speed only after a certain count is complete.
- an every bag mode it can be an overlapper and separate and overlap each bag by running over speed all the time. (Every bag made includes not separating a few bags in each roll). The over speed nip can aid in diverting the web to the appropriate alternative path by not running over speed during the last bag of the overlapped roll. Perforation detection is not required (but can be provided) when separating bags.
- An overlapper includes rods 311-315 mounted to move in a generally elliptical orbit that intersect the path of film 201 in two places (above and below the nip, preferably).
- the orbit is shown clockwise in Figure 2 , where the roll is being wound on a spindle 337, located along one of the alternative film paths.
- the rotor reverses direction and moves the rods in a counter-clockwise direction when a spindle 338 (located along the other alternative film path) is being used.
- the rods pull the film laterally, and can aid in separating, although the over speed nip alone can be used to separate if the overlapper is not installed.
- the rods temporarily accumulate the film to allow for overlapping succeeding bags. Overlapped regions are shown as 317 and 318, and 319 and 320.
- the rods are preferably 0.5" diameter steel rods supported on each end with a chain or timing belt, including a driven sprocket and a tensioner sprocket, preferably servo driven. This reduces the distance the web must jump where it is not supported.
- An air curtain or series of air nozzles may be used to help the film jump the gap created by the mechanical overlap rods.
- Alternatives includes using air for overlapping, using fewer or more rods, using a different orbit, or other known overlappers.
- Over speed rollers 307 and 309 preferably include 0,25" wide grooves on a 1" repeat across the face of both roller faces, to provide clearance for a plurality of air nozzles 322-325 in each groove.
- Air nozzles 222-225 are used to direct the film to the desired spindle.
- the upper air nozzles 322 and 323 are used to divert the web to the opposite roller and the lower air nozzles 324 and 325 are used to divert the web down to a nearby conveyor belt 327 or 328, disposed along the film path.
- air nozzles 322 and 325 are off, and air nozzles 323 and 324 are on, directing film 201 toward spindle 337.
- Nozzles 322 and 325 are on, and nozzles 323 and 324 off, when the film is being directed toward spindle 338.
- the nozzles When a roll is completed, and the nozzles had been directing the trailing edge of the roll to one spindle, the nozzles are then controlled to direct the leading edge of the next roll of bags to the other spindle. Thus, the nozzles alternately direct the film to one of two paths.
- the change in paths, or alternations, occur after a plurality of bags -- a roll -- are wound. If the separator is in an intermittent mode, then nozzles perform an alternation after separating. In the every bag (overlap) mode they perform an alternation after a given count.
- the preferred embodiment provides that the right and left spindles and associated components are mirror images of one another, although this is not required.
- spindle 338 winds counter-clockwise and spindle 337 winds lockwise.
- the web as it travels to spindles 337 and 338, is preferably held against conveyor belts 327 and 328 with a series of round elastic ropes.
- one embodiment provides for static pinners 334 and 331 to hold the film against conveyor belts 227 and 228.
- Static pinners 330 and 331 can be bi-polar static pinners to not only hold the film against the conveyor, but to also cause the tail of the last bag of a roll to cling to the roll, by turning off the static neutralizer for the last few bags.
- the invention provides for statically pinning a tail of a last bag in a roll to the roll, to aid in manual handling of rolls, in automation handling of roll, and reduce the need to glue the tail of the last bag.
- Conveyor belts 227 and 228 are preferably one wide belt or a series of narrower belts with a 1" gap there between.
- the gap allows for pop-up finger 340, 341 (one or more in various alternatives) to help direct the leading edge of the first bag into an air horn 342, 343, and around the winding spindle. Pop up fingers 340 and 341 intermittently direct the film near the spindle and retract after the first bag is transferred.
- the gap between belts also allows hot melt tail gluing to be used with less chance of glue getting on a conveyor belt.
- Conveyor belt 328 is preferably mounted such that it pivots at an end closest to the infeed nip, and away from fixed position spindle 338, as shown by the dashed lines and arrow 345, as the film roll grows in diameter. A like pivot is used for conveyor 327.
- Each winding station may have a paper bander 346, 347. Because one bander can be used while the opposite spindle is winding, two banders which each run 20cpm allow the overall winder to cycle at 40cpm. Also, because there are two winding stations, each cycling at 20 cpm, pneumatic devices may be used with an overall speed of 40cpm.
- the spindles preferably use a prior art CMDĀ®-designed TeflonĀ® sleeve or bead blasted/chromed design. Also, because the spindles are fixed position spindles, they can use a simple push-off device that does not need to pivot, and can scrape at substantially 360 degrees around the spindle circumference to remove film easier with less chance of binding. The fixed position also allows for simple air connections to the spindles.
- FIG. 3 An embodiment of a winder 300 according to the invention is shown in Figure 3 and can include many of the features described above, including two winding stations. The various embodiments may be combined as desired, choosing features from each or the prior art that suit the needs of a particular application.
- Winder 300 includes an infeed nip defined between a pair of infeed rollers 403 and 405, a controllably over speed nip defined between a pair of rollers 407 and 409 for separating adjacent bags, and spindles 437 and 438. Generally, winder 300 operates consistent with winder 200, except as described below.
- Film or web 201 approaches the infeed nip by wrapping or following along a portion of the surface of roller 403 before reaching the nip.
- the film rides on an are equal to or more than 10, 45, 60, or 90 degrees in various embodiments.
- a plurality of stationary film guides 412, mounted on support 410, are recessed in roller 403.
- the surface of guides 412 is flush with the surface of roller 403 such that the web rides on the film guides, ropes (not shown), and the surface of roller 403.
- Recessed in a roller includes residing partially or completely in recessed areas on a roller.
- the recesses may be grooves or channels, and have a depth in the preferred alternative embodiment such that the web rides on both the film guides and the surface of roller 403.
- Guides 412 are preferably comprised of metal with a slippery coating and fit closely within the recesses of roller 403, such as clearance on the sides of no more 0.010 inches. This allows the film to lie flat without getting caught in spaces between the recesses and guides 412.
- roller 403 is shown with recesses 501 for film guides 412 and recesses 502 for ropes. This embodiment provides for nine guides and two ropes. Also, a plurality of air relief holes 505 (counterbored, 1/2" inch diameter by 1/8" deep) are provided to help the film lie flush on the surface of roller 403 (and on film guides 412, not shown on Figure 5 ). There are corresponding holes on the opposite side (180 degrees away from holes 501) on roller 403.
- a film follows the surface of a roller when it rests generally on the outer surface, and does not require the film to conform to the recesses etc.
- Film guide includes a structure used to support and guide the film, and does not require driving the film.
- Surface of a roller as used herein, the surface of a roller that is substantially the same distance from the axis of the roller.
- Film guides 412 may be co-extensive with the arc of roller 403 on which the film rides prior to the nip, or it may be more or less extensive. Preferably, film guides 412 and the arc are of sufficient extent to support or touch film 201 as it approaches the infeed nip. The inventors have found that the stationary film guides, along with approaching the nip from the side so the film 201 passes over guides 412, ropes (not shown) and roller 403 allow for faster and more stable operation.
- Film guides 412 extend through the infeed nip, but are recessed just below (1/16 inches, e.g) the surface of roller 403 closest to the film path at the nip, so as to allow the infeed nip to properly pinch film 201.
- Surface of a roller closest to the film path is the surface of a roller that the film generally follows. Below a surface of a roller, as used herein refers to closer to the axis of roller than the surface of the roll that makes contact with film.
- a plurality of film guides 460 are connected to film guides 412, and mounted on a block 464.
- Film guides 412 and 460 may be considered continuous film guides.
- a plurality of guides 462 are mounted on a block 466 and guide film 201 from the reverse side of film 201.
- Film guides 460 and 462 are preferably spaced sufficient to allow the film to pass easily, such as a total of 1/16 inch therebetween.
- Guides 460 and 462 are recessed in rollers 403, 405, 407 and 409, and at the infeed and over speed nips are recessed below the surface to avoid interfering with the nip (for example 1/32 inch each).
- Film guides 412, 460 and 462 may be one or several individual guides.
- Ropes that wrap rolls 403 and 407 are also used to move the film. Ropes are particularly helpful in driving thin films, such as 6 micron high density polyethylene, but are omitted for some applications, particularly for heavier films.
- the preferred embodiment uses ropes toward the center of the film, and guides toward the edges for more support.
- ropes toward the center of the film For example, with a six inch web an arrangement of 3 film guides 412 (two of which are near the edges of film 201, and one in the center), and two ropes, each between the film guides, is used. More film guides are used for wider films (and/or more ropes may be used as needed).
- Winder 300 may be operated in a continuous mode or an overlap mode.
- film 201 is separated into adjacent bags by over speed rollers 407 and 409.
- Rollers 407 and 409 may be intermittently brought together or intermittently sped up to separate film 201 into bags. (Other methods of separating adjacent bags may be used as well).
- Figure 3 shows a bag 201 a which has been separated from film 201.
- rollers 407 and 409 may be run at film speed, left separated, or be idler rolls.
- Guides 460 and 462 extend past the nip where bags are separated, to help film 201 jump the gap below rollers 407 and 409.
- Air sources or air nozzles/pipes 404a and 406a (mounted on supports 404 and 406) divert the film from its path to take up excess film as the overlapping occurs.
- nozzle 404a is active, and diverts the film from the film path and to the left, thus taking up the excess film. Diverted from the film path, as used herein, refers to accumulating bag or film when the bag or film follows a path other than the film path.
- Nozzle 404a directs air at least partially in a cross direction, and toward the right side of the film on Figure 3 .
- Nozzle 406a also directs air at least partially in a cross direction, but to the opposite (left) side of the film.
- Nozzles 404a and 406a may each be implemented with multiple nozzles, a single nozzle, and/or an air pipe.
- Bag 201a then moves to a winding infeed nip between rollers 411 and 413, which are under sped to account for overlapping.
- the preferred embodiment calls for under speeding them by 20%.
- Ropes 411a and 413a are provided around rollers 411 and 413 to help move and guide the film to one or more downstream conveyors 427/428.
- One embodiment provides for a single winding station.
- the alternative preferred embodiment of Figure 3 provides for two windings stations, each having a spindle 437/438, conveyor 427/428 wrapped about a roller 468.
- bag 201a may be directed to the desired winding station a rotating brush 416.
- Brush 416 is preferably a full width brush positioned to touch ropes 411a/413a and/or belts 427/428, and at a location where the film path can follow either a first alternative spindle film path to spindle 437 or a second alternative spindle film path to spindle 438.
- Figure 3 shows overlapped bags 201 and 202b going to winding station 437, thus brush 416 is rotating clockwise. The preferred embodiment provides for rolls to be alternately wound on spindles 437 and 438.
- bags 201a and 201b are guided past an optional barrel pinner 422, an optional hot glue applicator 424, and an optional bander 426 (i.e., a station or device to apply a band about a roll of wound bags).
- a pair of airhorns 442/433 are used to facilitate starting a roll.
- a pair of sorting trays 450/451 direct wound rolls into a bin, or to the floor, depending if they are accepted or rejected.
- a pair of fingers/strippers 440 and 441 are disposed near spindles 437/438 to help remove rejected bags and/or rejected rolls.
- bander 426 includes a conveyor 610 wrapped around a roller 612, a film guard 619, a source of air 616, and a source of air 608 mounted on air horn 343, which cooperate with the conveyor 428 to wrap a tape 601 about a wound roll of bags 618 on spindle 438 ( Figure 3 ).
- Bander 426 is shown for the left bander on Figure 3 , and the right bander will be a mirror image.
- Nozzles 608 direct air to tape 601 and help support the tape (i.e., keep it from falling before it reaches roll 618.
- Guard 615 helps prevent tape 601 from wrapping around conveyor 610 and roll 612
- nozzle 616 directs air to force tape 601 downward, around the right side of roll 618, thereby aiding tape 601 wrapping about roll 618.
- air from nozzles 608 support the tape as it wraps about the bottom of roll 618, thereby aiding tape 601 wrapping about roll 618.
- Nozzles 608 and 616 may each be single nozzles, an air pipe, or each a plurality of nozzles. Also, nozzles 608 may be mounted on any support, and need not be on airhorn 433. Nozzles 616 may also be mounted on any support.
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Abstract
Description
- There are a variety of known bag machines used for making bags from a continuous film, such as a polyolefin film. Commercially available bag machines, winders, and folders include CMDĀ® Models 3113, 1100 series, 1500, 4013RO series, and other machines described at www.cmd-corp.com. Examples of patented prior art bag machines include
US Patents 6117058 ,4934993 ,5518559 ,5587032 and4642084 andUS Patent Publication 20060084559 . - Generally, those machines unwind the film from a roll. The film may be a single film, or folded film, or a (flat) tube. Bags are formed by placing seals on the film in desired locations. The seals may form the bottom/top and/or sides of the bag. Perforations may be included denoting sides or top/bottom of adjacent bags. Other operations may be performed such as separating and/or folding.
- The bag machine shown in
USP 6117058 is owned by the owner of this invention, and may be seen inFigure 1 . Prior artrotary bag machine 100 continuously processes a web orfilm 201 using adancer assembly 203, a pair of drum-inrolls 205 and 206 (203-206 are part of an input section), asealing drum 208, a pair of drum-out rolls blanket 213, a pair of knife-inrolls out rolls 219 and 220 (210-220 are part of an output section), and acontroller 221. Input section or unwind section, as used herein, includes the portion of a bag machine where the web is received, such as an unwind and a dancer assembly. Output section, as used herein, includes assemblies that act on a web downstream of the seals being formed, such as perforators, winders, folders, etc. - The web is provided through
dancer assembly 203 to a formingdrum 208.Drum 208 includes a plurality ofseal bars 209. The seals bars are heated and create the seals forming the bags from web 201-Web 201 is held against drum 208 (and the seals bars) by a TeflonĀ® coated blanket. End to end bags are formed with one seal from the drum, and side to side bags are formed with a pair of seals. The drum diameter may be adjusted and/or less than all of the seal bars turned on to determine the distance between seals, and hence bag size. - Generally, rotary motion machines register a downstream rotary knife to perforate between two seals, or beside a seal. The prior art of
Figure 1 provides that afterweb 201 leavesdrum 208 it is directed torotary knife 218, which creates a perforation between bags, or could separate adjoining bags. When the bags are end to end bags, the perforation is placed close to the single seal such that when the bags are separated, the perforation and the perforated end is the top of one bag, and the seal is the bottom of the adjoining bag. -
Controller 221 is connected to the various components to control speed, position, etc. Sensors may be used to sense print on the web to form the seals and/or register the perforation (place it in the correct location with respect) to the seal. Also, sensors may detect seals to try and create the perforation in the correct location. - Many bag machines include a winder after the knife. Examples of prior art winders include
US Patents 4,667,890 ;4,695,005 ;6186436 ; and5899403 . Prior art winders either have a rotating turret with multiple spindles or a single fixed spindle and web stopper. A desired number of bags is wound about the spindle, forming the rolL The roll is then pushed off, often using a push off palm. The roll may be paper banded, and unacceptable rolls may be culled. The prior art describes various ways to properly direct the leading end of the roll to the desired spindle, and to control the winding. - Multiple spindle prior art winders require rotating a turret to move the spindle to the starting and winding position. This adds complexity to the machine, and makes air connections difficult. Also, because the turret rotates, it is used with a push off palm that scrapes the spindle over only part of its circumference. Moreover, moving turrets, push off palms, and air horns can interfere with one another or crash. Stationary winders are limited in the speed because of the time it takes to remove a roll. Prior art winders typically cannot used pneumatic devices in applications over 30 cpm. Rather, such a winder capable of 40 cpm would require servo controlled devices.
- Accordingly, a winder with stationary spindles that operates at higher speeds than prior art single spindle systems is desirable. Preferably such a winder can be used with pneumatic devices, and can receive air connections easily.
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US2008/0627279 discloses a method and apparatus for making and winding bags. The bag machine includes an unwind section, a forming section, and a winder. The winder has an infeed nip and two spindles. Each spindle is located along a respective one of two alternative film paths. The spindles can be fixed position spindles and the alternative film paths can be predominantly downward. An over speed nip may be provided between the infeed nip and the alternative film paths to separate rolls or to separate all bags. An overlapper can be included. Rods that travel in an elliptical orbit, and/or air nozzles can be part of the overlapper. Air nozzles can also be used to direct the film to the appropriate alternative path. Conveyor belts along the alternative film paths can be used to guide the film. Static pinners can be used to help bold the bags to the conveyor, or the last bag to the roll. Pop-up fingers and air horns can help start the roll on a spindle. Paper banders can be use, as can pneumatic devices. A push off device that scrape the spindles over substantially 360 degrees can be used. -
GB1431350 -
US2002/030135 discloses an apparatus and a method of producing a roll of bags, a bag feeding device is arranged to feed bags one by one to a winding device. The winding device includes a rotating spindle which is arranged to engage with each bag separately to wind the bag on it, so as to build a roll of bags in which the bags are unconnected to one another yet firmly held together. The winding device comprises at least two separate winding stations, each winding station being connected to one or more bag feeding devices; and a switch that is arranged upstream of a bag feeding device to direct the bags from one winding station to the other when a roll of bags has been completed in one of the winding stations. - According to a first aspect of the invention there is provided a winder for a bag machine or sheet machine as set out in claim 1.
- According to a second aspect of the invention there is provided a method of winding bags as set out in claim 9.
- The winder for the bag machine may comprise an infeed nip and two spindles. Each spindle is located along one of two alternative film paths.
- The method of winding bags from a continuous film may include feeding the film into a winder and alternately directing the film along a alternative paths to one of two spindles. The alternations occur after a plurality of bags, such as a roll, are wound.
- The bag machine may include an unwind section, a forming section, and a winder. The winder includes an infeed nip and two spindles, each located along a respective alternative film path.
- The spindles are fixed position spindles in one alternative embodiment.
- The alternative film paths are predominantly downward in other embodiments.
- An over speed nip may be provided between the infeed nip and the alternative film paths.
- The over speed nip operates in an intermittent mode and in an every bag mode, and/or has a user adjustable over speed, in various embodiments
- The winder includes an overlapper between the infeed nip and the alternative film paths, in other embodiments. The overlapper can include a plurality of rods moved in an orbit that intersects the film path in at least two locations. The orbit can be generally elliptical.
- The overlapper includes a plurality of air nozzles in other embodiments.
- The over speed nip has air nozzles disposed to direct the film to one alternative film path, and other air nozzles disposed to direct the film to the other alternative film path.
- The winder includes conveyor belts along the alternative film paths in other alternatives. The conveyor belts can pivot at an end closest the infeed nip.
- The winder includes static pinners along the alternative film paths, that can be bipolar, in various embodiments.
- The winder includes pop-up fingers disposed along the alternative film paths in other alternatives.
- The winder includes paper banders near the spindles in various embodiments.
- The winder is driven with pneumatic air in one embodiment.
- The winder includes push off devices that scrape the spindles over substantially 360 degrees in other alternatives.
- The winder for a bag or sheet machine may include an infeed nip, a film guide or guides and spindle or spindles. The film approaches the indeed nip by following the surface of an indeed roller for an arc of at least 10 degrees. The film path is then through the nip and toward the spindle. The film guide is disposed along the film path for at least the arc on which the film wraps the indeed roll, and further along the film path downstream of the infeed nip. The film guide is recessed in the infeed roller at least along the arc.
- The method of winding bags from a continuous film may include guiding the film with a first infeed roller and at least one film guide recessed in the first infeed roller, along the surface of the rirst infeed roller for an arc of at least 10 degrees. Then guiding the film with the film guide and roller to an infeed nip. Then guiding the film to at least one winding station and winding the bags.
- The film guide is stationary and touches the film along the arc according to one embodiment.
- The film guide is further recessed below the surface of the roll at the infeed nip according to another embodiment.
- The arc is at least 45, 60 and 90 degrees in various embodiments.
- The winder includes a second spindle, and each spindle is on an alternative film path in another embodiment.
- A rotatable brush is disposed at a location where the film path can follow either the alternative film path to direct the film to a selected path in another embodiment.
- An over speed nip is located on the film path downstream of the infeed nip and upstream of the brush and/or a source of air blow to the film from one side and/or the other side and diverts film from the film path to take up excess film for overlapping adjacent bags in other embodiments. The sources of air are located upstream of the rotatable brush and downstream of the over speed nip in another embodiment
- A finger/guide is disposed near the spindle or spindles to remove rejected bags in another embodiment.
- There are three film guides extending across the film in another embodiment.
- A second film guide is disposed on the opposite side of the film in another embodiment.
- A bander for the bag machine may include a conveyor for providing tape to a spindle and two sources of air. The tape approaches the spindle from a first direction and passes above the spindle, and wraps around a roll of bags wound about the spindle. One source of air is directed to support the tape as the tape approaches the spindle. The other source of air is directed to force the tape around the roll of bags as the tape passes over above the spindle, aiding the tape wrapping about the roll. The one source of air also supports the tape as it wraps about the roll of bags, thereby aiding the tape wrapping about the roll.
- The first source of air is mounted on an air horn disposed to be moved to and away from the spindle in an alternative embodiment.
- Other principal features and advantages of the invention will become apparent to those skilled in the art upon preview of the following drawings, the detailed description and the appended claims.
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-
Figure 1 is diagram of a prior art bag machine; -
Figure 2 is diagram of a prior art winder; -
Figure 3 is diagram of a winder in accordance with the present invention; -
Figure 4 is diagram of a bander winder in accordance with the present invention; and -
Figure 5 is diagram of an infeed roller in accordance with the present invention. - Before explaining at least one embodiment of the invention in detail it is to be understood that the invention is not limited in its application to the details of construction and the arrangement of the components set forth in the following description or illustrated in the drawings. The invention is capable of other embodiments or of being practiced or carried out in various ways. Also, it is to be understood that the phraseology and terminology employed herein is for the purpose of description and should not be regarded as limiting. Like reference numerals are used to indicate like components.
- While the present invention will be illustrated with reference to a particular bag machine, method and winder, it should be understood at the outset that the invention can also be implemented with other machines, methods, and winders, including draw tape machines, rotary overlap machines, intermittent machine, sheet machines and other known machines.
- Generally, the present invention is described with respect to a winder that can be used with, or is part of, a prior art bag machine to make a roll of bags for easy packaging, transporting, dispensing, and use. The preferred embodiment is described with respect to a bag machine such as that shown in
US Patent 6117058 , or available commercially as the CMDĀ® 1270 bag machine, or a modular bag machine. The invention is contemplated as a winder, a winder and separator, a winder, separator and overlapper, or an entire bag machine. Overlapper, as used herein, includes a device or section that overlaps succeeding bags. The bag machine prior to the winder is described below, since it can be the prior art machine described above. Other bag machines may be used as well. - The winder receives the formed bags as a film, and can separate them using an over speed nip. Over speed nip, as used herein, includes a nip wherein at least one driven roller has a circumferential speed greater than the speed of the film prior to the nip. The nip can operate in an every bag mode, or in an intermittent mode to separate bags only at the start/end of rolls. Every bag mode, as used herein, includes operating for every bag within a roll. Intermittent mode, as used herein, includes not operating for every bag within a roll, such as operating only at the beginning or end of a roll, or for a few bags within a roll. The bags can be overlapped in the every bag mode.
- After separating, a film divertor directs the film to one of two spindles. Each winding spindle takes turns winding film, which eliminates bottlenecks and allows for higher speeds, higher cycle speeds, and lower count rolls. The film is directed by the divertor along one of two alternative film paths to one of the two spindles or winding stations. Film path, as used herein, is the path film takes through the bag machine or winder, excepting any area where film is accumulated for winding. Alternative film path, as used herein, includes a path followed by the film or bags a portion of the time the winder is in use.
- The alternative paths are preferably predominantly downward, allowing rejected film or missed transfer film to be rejected to the floor in a convenient location. Predominantly downward, as used herein, includes more vertical (with gravity) than horizontal. The spindles are fixed position spindles. Fixed position spindles, as used herein, includes spindles that do not move from a location, such as in an orbit, but can rotate.
- When the spindle in use is wound with a complete roll, the leading edge of the first bag of the next roll is directed along the other alternative path to the other spindle. Thus, the winder can wind immediately on the other spindle without moving the spindles, and without having to remove a roll before winding the next roll.
- Various embodiments use one or more of the following features, which can be used alone, or in many combinations. Air can be used to direct the film as desired, and pop-up fingers and/or an air horn can be used to start the roll. Static pinning can be used to bold the bags to the spindle, and bipolar static pinning can be used to hold the tail of the last bag of a roll to the roll. Conveyors can be used to guide the film along the alternative paths, and the conveyor can pivot as the roll gets larger, to accommodate its growing diameter. A paper bander can be used and the drying time for the glue can be accommodated since the glue can dry while the other spindle is being used. A push off device can be used to remove rolls, and can scrape substantially 360 degrees around the circumference of the spindle since the spindles are fixed position spindles. Substantially 360 degrees, as used herein, includes over the entire circumference except for occasional small interruptions.
- Turning now to
Figure 2 , a diagram of a prior art winder 200 is shown. Winder 200 may be downstream along the film path ofbag machine 100 ofFigure 1 . Many of the alternatives mentioned above are shown, although as stated above, all need not be included. -
Film 201 travels from perforator or knife 218 (Figure 1 ) to an infeed nip defined betweenrolls 303 and 305 (Figure 2 ), at least one of which is driven. The infeed nip draws or feeds the film into winder 200. (Infeed nip can refer to the infeed for a machine or a section. Here it is used to refer too the infeed of the winder section.) - The preferred embodiment provides for a vertical feed of the web through the indeed nip. This allows the machine to be uni-handed with respect to an operator side, and can accommodate both left and right hand floor plans.
-
Film 201, after leaving the infeed nip, is provided to an over speed nip defined betweenrolls Film 201 is provided to other stations directly, or indirectly after leaving the infeed nip in various embodiments). Preferably the over speed is servo driven and the over speed percent can be changed easily by the user for a wide perforation repeat distance, such as from 10" to 250" without changing parts. - In an intermittent mode it can run perforation-connected film and separate one of plurality of bags from its succeeding bag by running over speed only after a certain count is complete. In an every bag mode it can be an overlapper and separate and overlap each bag by running over speed all the time. (Every bag made includes not separating a few bags in each roll). The over speed nip can aid in diverting the web to the appropriate alternative path by not running over speed during the last bag of the overlapped roll. Perforation detection is not required (but can be provided) when separating bags.
- An overlapper includes rods 311-315 mounted to move in a generally elliptical orbit that intersect the path of
film 201 in two places (above and below the nip, preferably). Generally elliptical, as used herein, includes a non circular, non angular path. The orbit is shown clockwise inFigure 2 , where the roll is being wound on aspindle 337, located along one of the alternative film paths. The rotor reverses direction and moves the rods in a counter-clockwise direction when a spindle 338 (located along the other alternative film path) is being used. The rods pull the film laterally, and can aid in separating, although the over speed nip alone can be used to separate if the overlapper is not installed. The rods temporarily accumulate the film to allow for overlapping succeeding bags. Overlapped regions are shown as 317 and 318, and 319 and 320. - The rods are preferably 0.5" diameter steel rods supported on each end with a chain or timing belt, including a driven sprocket and a tensioner sprocket, preferably servo driven. This reduces the distance the web must jump where it is not supported. An air curtain or series of air nozzles may be used to help the film jump the gap created by the mechanical overlap rods. Alternatives includes using air for overlapping, using fewer or more rods, using a different orbit, or other known overlappers.
- Over
speed rollers upper air nozzles lower air nozzles nearby conveyor belt Figure 2 ,air nozzles air nozzles film 201 towardspindle 337.Nozzles nozzles spindle 338. - When a roll is completed, and the nozzles had been directing the trailing edge of the roll to one spindle, the nozzles are then controlled to direct the leading edge of the next roll of bags to the other spindle. Thus, the nozzles alternately direct the film to one of two paths. The change in paths, or alternations, occur after a plurality of bags -- a roll -- are wound. If the separator is in an intermittent mode, then nozzles perform an alternation after separating. In the every bag (overlap) mode they perform an alternation after a given count.
- The preferred embodiment provides that the right and left spindles and associated components are mirror images of one another, although this is not required. Thus,
spindle 338 winds counter-clockwise andspindle 337 winds lockwise. - The web, as it travels to
spindles conveyor belts static pinners 334 and 331 to hold the film against conveyor belts 227 and 228.Static pinners - Conveyor belts 227 and 228 are preferably one wide belt or a series of narrower belts with a 1" gap there between. The gap allows for pop-up
finger 340, 341 (one or more in various alternatives) to help direct the leading edge of the first bag into anair horn fingers -
Conveyor belt 328 is preferably mounted such that it pivots at an end closest to the infeed nip, and away from fixedposition spindle 338, as shown by the dashed lines andarrow 345, as the film roll grows in diameter. A like pivot is used forconveyor 327. - Each winding station may have a
paper bander - The spindles preferably use a prior art CMDĀ®-designed TeflonĀ® sleeve or bead blasted/chromed design. Also, because the spindles are fixed position spindles, they can use a simple push-off device that does not need to pivot, and can scrape at substantially 360 degrees around the spindle circumference to remove film easier with less chance of binding. The fixed position also allows for simple air connections to the spindles.
- Because there are two stations cycling at 20 cpm (counts per minute), the machine runs at 40 cpm, and more time is allowed for roll inspection, culling, and rejecting than is allowed by a single station 40cpm machine.
- An embodiment of a
winder 300 according to the invention is shown inFigure 3 and can include many of the features described above, including two winding stations. The various embodiments may be combined as desired, choosing features from each or the prior art that suit the needs of a particular application. -
Winder 300 includes an infeed nip defined between a pair ofinfeed rollers rollers spindles winder 300 operates consistent with winder 200, except as described below. - Film or
web 201 approaches the infeed nip by wrapping or following along a portion of the surface ofroller 403 before reaching the nip. The film rides on an are equal to or more than 10, 45, 60, or 90 degrees in various embodiments. - A plurality of stationary film guides 412, mounted on support 410, are recessed in
roller 403. Preferably, the surface ofguides 412 is flush with the surface ofroller 403 such that the web rides on the film guides, ropes (not shown), and the surface ofroller 403. Recessed in a roller, as used herein, includes residing partially or completely in recessed areas on a roller. The recesses may be grooves or channels, and have a depth in the preferred alternative embodiment such that the web rides on both the film guides and the surface ofroller 403.Guides 412 are preferably comprised of metal with a slippery coating and fit closely within the recesses ofroller 403, such as clearance on the sides of no more 0.010 inches. This allows the film to lie flat without getting caught in spaces between the recesses and guides 412. - Referring to
Figure 5 , one embodiment ofroller 403 is shown withrecesses 501 for film guides 412 and recesses 502 for ropes. This embodiment provides for nine guides and two ropes. Also, a plurality of air relief holes 505 (counterbored, 1/2" inch diameter by 1/8" deep) are provided to help the film lie flush on the surface of roller 403 (and on film guides 412, not shown onFigure 5 ). There are corresponding holes on the opposite side (180 degrees away from holes 501) onroller 403. - A film follows the surface of a roller when it rests generally on the outer surface, and does not require the film to conform to the recesses etc. Film guide, as used herein, includes a structure used to support and guide the film, and does not require driving the film. Surface of a roller, as used herein, the surface of a roller that is substantially the same distance from the axis of the roller.
- Film guides 412 may be co-extensive with the arc of
roller 403 on which the film rides prior to the nip, or it may be more or less extensive. Preferably, film guides 412 and the arc are of sufficient extent to support ortouch film 201 as it approaches the infeed nip. The inventors have found that the stationary film guides, along with approaching the nip from the side so thefilm 201 passes overguides 412, ropes (not shown) androller 403 allow for faster and more stable operation. - Film guides 412 extend through the infeed nip, but are recessed just below (1/16 inches, e.g) the surface of
roller 403 closest to the film path at the nip, so as to allow the infeed nip to properly pinchfilm 201. Surface of a roller closest to the film path, as used herein, is the surface of a roller that the film generally follows. Below a surface of a roller, as used herein refers to closer to the axis of roller than the surface of the roll that makes contact with film. - A plurality of film guides 460 are connected to film guides 412, and mounted on a
block 464. Film guides 412 and 460 may be considered continuous film guides. A plurality ofguides 462 are mounted on ablock 466 and guidefilm 201 from the reverse side offilm 201. Film guides 460 and 462 are preferably spaced sufficient to allow the film to pass easily, such as a total of 1/16 inch therebetween.Guides rollers - Ropes that wrap rolls 403 and 407 (and in one
embodiment 405 and 409) are also used to move the film. Ropes are particularly helpful in driving thin films, such as 6 micron high density polyethylene, but are omitted for some applications, particularly for heavier films. - The preferred embodiment uses ropes toward the center of the film, and guides toward the edges for more support. For example, with a six inch web an arrangement of 3 film guides 412 (two of which are near the edges of
film 201, and one in the center), and two ropes, each between the film guides, is used. More film guides are used for wider films (and/or more ropes may be used as needed). -
Winder 300 may be operated in a continuous mode or an overlap mode. In theoverlap mode film 201 is separated into adjacent bags by overspeed rollers Rollers separate film 201 into bags. (Other methods of separating adjacent bags may be used as well).Figure 3 shows abag 201 a which has been separated fromfilm 201. When in acontinuous mode rollers -
Guides rollers - Overlapping requires downstream the film move more slowly, and that excess film be taken up during the overlapping. The embodiment above (
Figure 2 ) shows one way to separate film and take of film for overlapping.Figure 3 shows another way of taking up excess film for overlapping. Downstream rollers rollers rollers - Air sources or air nozzles/
pipes supports 404 and 406) divert the film from its path to take up excess film as the overlapping occurs. As shown onFigure 3 ,nozzle 404a is active, and diverts the film from the film path and to the left, thus taking up the excess film. Diverted from the film path, as used herein, refers to accumulating bag or film when the bag or film follows a path other than the film path.Nozzle 404a directs air at least partially in a cross direction, and toward the right side of the film onFigure 3 .Nozzle 406a also directs air at least partially in a cross direction, but to the opposite (left) side of the film.Nozzles -
Bag 201a then moves to a winding infeed nip betweenrollers Ropes rollers downstream conveyors 427/428. - One embodiment provides for a single winding station. However, the alternative preferred embodiment of
Figure 3 provides for two windings stations, each having aspindle 437/438,conveyor 427/428 wrapped about aroller 468. - After leaving
rollers bag 201a may be directed to the desired winding station arotating brush 416.Brush 416 is preferably a full width brush positioned to touchropes 411a/413a and/orbelts 427/428, and at a location where the film path can follow either a first alternative spindle film path to spindle 437 or a second alternative spindle film path to spindle 438.Figure 3 shows overlappedbags 201 and 202b going to windingstation 437, thus brush 416 is rotating clockwise. The preferred embodiment provides for rolls to be alternately wound onspindles - After being properly directed by
brush 416bags optional barrel pinner 422, an optionalhot glue applicator 424, and an optional bander 426 (i.e., a station or device to apply a band about a roll of wound bags). A pair ofairhorns 442/433 are used to facilitate starting a roll. A pair of sortingtrays 450/451 direct wound rolls into a bin, or to the floor, depending if they are accepted or rejected. A pair of fingers/strippers spindles 437/438 to help remove rejected bags and/or rejected rolls. - One embodiment of
bander 426 is shown inFigure 4 and includes aconveyor 610 wrapped around aroller 612, a film guard 619, a source ofair 616, and a source ofair 608 mounted onair horn 343, which cooperate with theconveyor 428 to wrap atape 601 about a wound roll ofbags 618 on spindle 438 (Figure 3 ).Bander 426 is shown for the left bander onFigure 3 , and the right bander will be a mirror image. - As
tape 601 is moved byconveyor 610 to roll 618,tape 601 passes over the top ofroll 618.Nozzles 608 direct air to tape 601 and help support the tape (i.e., keep it from falling before it reachesroll 618.Guard 615 helps preventtape 601 from wrapping aroundconveyor 610 and roll 612 - After
tape 601 reaches roll 618,nozzle 616 directs air to forcetape 601 downward, around the right side ofroll 618, thereby aidingtape 601 wrapping aboutroll 618. Astape 601 is wound aboutroll 618 air fromnozzles 608 support the tape as it wraps about the bottom ofroll 618, thereby aidingtape 601 wrapping aboutroll 618. -
Nozzles nozzles 608 may be mounted on any support, and need not be onairhorn 433.Nozzles 616 may also be mounted on any support.
Claims (15)
- A winder (300) for a bag machine or sheet machine comprising;
an infeed nip defined between a first and a second infeed rollers (403, 405), and then a film path which is toward at least one winding station, the film path including a first spindle film path, a first spindle (437) being located along the first spindle film path;
characterised in that the film path approaches the first infeed roller (403) and follows the surface of the first infeed roller to the infeed nip for an arc of at least 10 degrees, at least one film guide (412, 460) being disposed along the film path for at least the arc to the infeed nip and further along the film path downstream of the infeed nip, wherein the at least one film guide is recessed in the first infeed roller at least along the arc. - The winder of claim 1, wherein the at least one film guide (412) is stationary and recessed in the first infeed roller (403) at least along the arc such that the film touches the at least one film guide and the first infeed roller;
- The winder of claim 2, wherein the at least one film guide (412) is recessed in the first infeed roller (403) at the infeed nip such that a surface of the at least one film guide closest to the film path is below a surface of the first infeed roller closest to the film path; and
wherein the arc may be at least 60 degrees; or
wherein the arc may be at least 90 degrees. - The winder of claim 3, further comprising a second spindle (438), wherein the first spindle film path is a first alternative film path whereby the film, after leaving the infeed nip, can follow the first alternative film path nip to the first spindle to be wound about the first spindle (437), and the film path includes a second spindle film path, that is a second alternative film path, and a second spindle (438) is located along the second alternative film path, whereby the film, after leaving the indeed nip, can follow the second alternative film path nip to the second spindle to be wound about the second spindle.
- The winder of claim 4, further comprising a rotatable brush (416) disposed at a location where the film path can follow either the first or second alternative film path, and the film is directed to the first alternative film path when the brush rotates clockwise, and the film is directed to the second alternative film path when the brush rotates counterclockwise.
- The winder of claim 4, further comprising at least a first finger (440) disposed near the first spindle (437) to remove rejected bags and at least a second finger (441) disposed near the second spindle (438) to remove rejected bags; or
wherein the at least one film guide is at least three film guides (412). - The winder of claim 5, further comprising an over speed nip defined between two over speed rollers (407, 409), located along the film path downstream of the infeed nip and upstream of the rotatable brush, and upstream of the first and second alternative film paths, wherein the film moves from the infeed nip to the over speed nip, then to the rotatable brush (416), and then to one of the first and second alternative film paths.
- The winder of claim 7, further comprising a first source of air (404a) directed at least partially in a first cross direction toward the film path and a first side of the film, whereby a part of the film is diverted from the film path, thereby taking up excess film for overlapping adjacent bags; and
wherein the winder may further comprise a second source of air (406a) directed at least partially in a second cross direction toward the film path and a second side of the film, whereby a second part of the film is diverted from the film path, thereby taking up excess film for overlapping adjacent bags; and
wherein the first and second sources of air may be located upstream of the rotatable brush (416) and downstream of the over speed nip. - The winder of claim. 5, further comprising at least a second film guide disposed along the film path from upstream of the infeed nip to near the over speed nip, wherein the at least a second film guide is on an opposite side of the film from the at least one film guide.
- A method of winding bags from a continuous film, comprising;
guiding the film with a first infeed roller (403), then guiding the film to at least one winding station, and winding the bags at the first winding station;
characterised in that the film is also guided with at least one film guide (412) recessed in the first infeed roller, along the surface of the first infeed roller for an arc of at least 10 degrees, the film then being guided with the at least one film guide and the first infeed roller to an infeed nip defined between the first and a second infeed roller (405). - The method of claim 10, wherein guiding the film with the first infeed roller (403) and the at least one film guide (412) includes having the film in contact with the at least one film guide and the first infeed roller at least along the arc.
- The method of claim 11, wherein guiding the film with the first infeed roller (403) and the at least one film guide (412) includes doing so along the surface of the first infeed roller for at least an arc of 60 degrees; or
wherein guiding the film with the first infeed roller and the at least one film guide includes doing so along the surface of the first infeed roller for at least an arc of 90 degrees. - The method of claim 11, further comprising guiding the film to a second winding station and winding the bags at the second winding station, wherein the film is guided to the first winding station until a first roll of bags is wound, and then the film is guided to the second winding station, until a second roll of bags is wound.
- The method of claim 13, further comprising rotating a brush (416) clockwise to direct the film to the first winding station and rotating the brush counter clockwise to direct the film to the second winding station; and
wherein the film may be comprised of a series of bags formed with seals and perforations, comprising separating bags from adjacent bags in the film by providing the film to an over speed nip; and
wherein the method may further comprise blowing air at the film in a first cross direction toward a first side of the film to divert a part of the film from the film path, thereby taking up excess film for overlapping adjacent bags; and
wherein the method may further comprise blowing air at the film in a second cross direction toward a second side of the film, which is opposite the first cross direction, to divert a part of the film from the film path, thereby taking up excess film for overlapping adjacent bags. - The method of claim 10, further comprising moving a finger (440, 441) to remove rejected bags; or
wherein then guiding the film with the at least one film guide (412) and the first infeed roller (403) to an infeed nip includes guiding the film between at least a second film guide and the at least one film guide.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US12/135,738 US20090019817A1 (en) | 2006-09-14 | 2008-06-09 | Bag Machine And Winder |
PCT/US2009/031214 WO2009151653A1 (en) | 2008-06-09 | 2009-01-16 | Bag machine and winder |
Publications (3)
Publication Number | Publication Date |
---|---|
EP2285722A1 EP2285722A1 (en) | 2011-02-23 |
EP2285722A4 EP2285722A4 (en) | 2011-11-30 |
EP2285722B1 true EP2285722B1 (en) | 2013-12-18 |
Family
ID=41417024
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP09762949.7A Active EP2285722B1 (en) | 2008-06-09 | 2009-01-16 | Bag machine and winder |
Country Status (11)
Country | Link |
---|---|
US (1) | US20090019817A1 (en) |
EP (1) | EP2285722B1 (en) |
CN (1) | CN102089231B (en) |
AU (2) | AU2009258090B2 (en) |
CA (2) | CA2940372C (en) |
DK (1) | DK2285722T3 (en) |
ES (1) | ES2452698T3 (en) |
RU (1) | RU2489341C2 (en) |
TW (2) | TWI510360B (en) |
UA (1) | UA102253C2 (en) |
WO (1) | WO2009151653A1 (en) |
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CN103407820B (en) * | 2013-08-21 | 2015-10-14 | č„æå®čŖ天åé³å°å·å č£ č®¾å¤ęéå ¬åø | The wallpaper material collecting device of commutation conveying |
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ES2673155B1 (en) * | 2016-12-19 | 2019-03-12 | Exclusivas Nimbus S L | METHOD AND FASTENING DEVICE OF ROLLS OF PLASTIC FILM BAGS UNITED IN THE FORM OF BAND, AND ROLL OF BAGS SUGGESTED OBTAINED |
CN111605248B (en) * | 2020-06-12 | 2021-12-10 | ę±č„æå¾·ę°č¾¾ęŗč½ęŗę¢°ęéå ¬åø | Winding device for bag making machine |
CN115108391B (en) * | 2022-07-22 | 2024-02-27 | å®å¾½åÆ嵩å ēµē§ęęéå ¬åø | Feeding system convenient for gap adjustment |
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-
2008
- 2008-06-09 US US12/135,738 patent/US20090019817A1/en not_active Abandoned
-
2009
- 2009-01-16 CA CA2940372A patent/CA2940372C/en not_active Expired - Fee Related
- 2009-01-16 RU RU2010154219/13A patent/RU2489341C2/en not_active IP Right Cessation
- 2009-01-16 WO PCT/US2009/031214 patent/WO2009151653A1/en active Application Filing
- 2009-01-16 ES ES09762949.7T patent/ES2452698T3/en active Active
- 2009-01-16 EP EP09762949.7A patent/EP2285722B1/en active Active
- 2009-01-16 CA CA2727368A patent/CA2727368C/en not_active Expired - Fee Related
- 2009-01-16 CN CN200980122257.1A patent/CN102089231B/en not_active Expired - Fee Related
- 2009-01-16 UA UAA201013713A patent/UA102253C2/en unknown
- 2009-01-16 AU AU2009258090A patent/AU2009258090B2/en not_active Ceased
- 2009-01-16 DK DK09762949.7T patent/DK2285722T3/en active
- 2009-06-08 TW TW098118984A patent/TWI510360B/en active
- 2009-06-08 TW TW104127814A patent/TWI548510B/en active
-
2014
- 2014-08-13 AU AU2014213508A patent/AU2014213508B2/en not_active Ceased
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US20090019817A1 (en) | 2009-01-22 |
AU2009258090B2 (en) | 2014-05-15 |
CA2727368A1 (en) | 2009-12-17 |
AU2014213508A1 (en) | 2014-09-04 |
WO2009151653A8 (en) | 2010-11-25 |
TWI548510B (en) | 2016-09-11 |
WO2009151653A1 (en) | 2009-12-17 |
UA102253C2 (en) | 2013-06-25 |
ES2452698T3 (en) | 2014-04-02 |
RU2489341C2 (en) | 2013-08-10 |
AU2009258090A1 (en) | 2009-12-17 |
EP2285722A4 (en) | 2011-11-30 |
CN102089231A (en) | 2011-06-08 |
TW201544305A (en) | 2015-12-01 |
CA2727368C (en) | 2016-10-11 |
CN102089231B (en) | 2015-06-03 |
CA2940372A1 (en) | 2009-12-17 |
AU2014213508B2 (en) | 2015-09-24 |
CA2940372C (en) | 2018-01-02 |
TW201020103A (en) | 2010-06-01 |
EP2285722A1 (en) | 2011-02-23 |
RU2010154219A (en) | 2012-07-20 |
DK2285722T3 (en) | 2014-03-17 |
TWI510360B (en) | 2015-12-01 |
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