Abstract: A recycling bag assembly is formed from a series of plastic bags similar to trash or garbage bags temporarily secured together by heat tacking or otherwise. The individual bags are usually color coded to facilitate identification of the solid waste material that is to be collected in them for collection and transport to a disposal facility. A method of widespread regular controlled distribution of the bag assemblies is also provided by inserting or otherwise combining the bag assemblies with newspapers prior to delivery of such papers and subsequent delivery of the bag assemblies with such papers.

Abstract: A method for making block of side-gussetted, bottom-weld bags. Each bag has an opening on one side to fascilitate the removal of individual bags from the block.

Abstract: Plastic bag are stacked as they are received from a bag making machine by a radial arm transfer wheel whose suction arms engage the bags by transferring edges thereof and with the ends of the arms so that the bags are pressed onto needles of needle bars on a needle bar basket. The needle bars are rotated, with the bags suspending therefrom the spindling position through an intermediate position into a smoothing and removal position in which the hanging stack is lifted to a horizontal orientation and smoothed by a beam movable above the stack and having a smoothing brush engaging the stack. In this latter position a stripper is shifted past the needle bar therefrom. The stack is carried away by a clamp.

Abstract: A device for collecting bags or sacks in a machine for making the bags or sacks is in the form of a receiving rod which is mounted in the machine frame and extends transversely to the direction in which the bags or sacks to be deposited are advanced or conveyed so that, in use, the bags or sacks are draped over the rod.

Abstract: The present invention is a method of continuously making thermoplastic film bags having one-side-free for separation from an opposite side. The method includes providing a continuous tube of thermoplastic film for formation of the bag, such tube having a continuous surface which forms opposing sides of the bags. The tube is directed to a bag forming means which continuously flattens the tube into at least the opposing sides of the bag. The tube must intermittently be partially severed on one of the opposing sides at intervals corresponding to single bag lengths, such severance being made at a location for providing detachable separation of the one wall from the opposing wall. Next a sealed seam is formed across the tube at intervals which provide bottoms to each of the bags, and the bags are then collected in a stack where they are substantially aligned followed by fusing the stack of substantially aligned bags adjacent the severance in the one side for separating the bags from stack one side at a time.

Abstract: A process of severing and subsequently stacking web section is disclosed, which in their central portions are provided with locating holes and preferably consist of double bags which have been severed from a tubular or semitubular, continuous plastic film web and are closed by hot-wire welding and have opening-defining edges. The web sections are delivered by a delivering means preferably consisting of a so-called wicketer having pairs of inner and outer wicketer arms, which are arranged in a starlike array and rotate about a horizontal axis, the web sections are deposited by said delivering means in a stacking station into a stacking conveyor, which consists of endless tensile elements, which are trained around reversing pulleys or rollers and are intermittently driven and provided with upstanding stacking pins. The stacks formed by the web sections placed on the stacking pins are intermittently carried off by an intermittent advance of the tensile elements.

Abstract: The apparatus for manufacturing bags in plastic material comprises a welding assembly having a pair of fixed jaws and a jaw which is movable therebetween for clamping respective alternately advancing tubular bands made of plastic material. A cutting element, carried by a flexible belt rotatable on the movable jaw, is adapted to cut the bands upon clamping the movable jaw on the fixed jaws. An assembly for extracting and accumulating the bags is provided with a plurality of needles at each fixed jaw and actuated with reciprocating motion in the direction of sliding of the movable jaw so as to penetrate a bag clamped between the jaws. The apparatus also comprises a fork for placing the bag adjacent to the previously produced bags supported on the needles, and a slider for unloading a pack of manufactured bags.

Abstract: A method and apparatus for transferring and bundling plastic bag sheet material wherein bag cycle speed is automatically slowed, but not stopped, during a bundle transfer operation and cycle speed is resumed after one slow speed bag production cycle.

Abstract: A machine for the manufacture and stacking of bags, pouches and the like made from a sheath of a thermoplastic material in which an upper welding jaw and a belt driven horizontal cutting blade are slidably mounted to each other for vertical movement relative to each other and the lower welding jaw is also mounted for moving vertically and has a downstream projecting holding shoulder which has a horizontal transverse counter-blade-groove cooperating with the blade in a jaws lowered and closed position for cutting a portion of the sheath which is flexed between the shoulder and a clamp which presses an advanced segment of the sheath to a stacking table. The stacking table includes a vertically moveable pin carrier for impaling the severed end of a formed bag onto a transverse row of needles.

Abstract: Apparatus for stacking flat articles which in an intermediate portion are formed with locating holes and preferably consist of double bags having opening-defining edges disposed adjacent to their center line. The bags are fed by a wicketer and deposited in a stacking station on an endless stack conveyor and meedled onto raised upstanding stacking pins to form stacks. The stacking pins are operated to be lowered to release the needled stack which then advances to a succeeding severing station provided with a heated knife, which severs the stacks along a center line extending in the direction of stack travel. Additional conveyor belts are provided for retaining the separated stacks on the stack conveyor.

Abstract: A plurality of bags, each having an upright handle at either lateral edge thereof, is formed into a bag-pack, and the bag-pack is retained on a supporting rack by providing upright slits in the handles of each bag through which arms of the supporting rack extend. Unlike holes which are formed in the bag handles, upright slits do not cause weakening of the handles. In addition, the stacked handles of the bags are punched with a heated pin having a diameter no larger than approximately three thirty-seconds of an inch, to weld together the stacked handles of the bags, thereby permitting convenient mounting of the stacked handles on the arms of the supporting rack, without substantially weakening the bag handles. The individual bags are readily detachable from the bag-pack, because the pin is uniformly heated by being placed in a passageway in a block of metal heated to a temperature in the range of about 250.degree.-260.degree. F.

Abstract: A bag making machine having a combination of a first dancer with multiple-rolls and a second dancer with a single roll for accumulating a web of flattened tubular thermoplastic material between constant and intermittent web feed sections of the bag making machine.

Abstract: A machine for the manufacture and stacking of bags, pouches and the like made from a sheath of a thermoplastic material in which an upper welding jaw and a belt driven horizontal cutting blade are slidably mounted to each other for vertical movement relative to each other and the lower welding jaw is also mounted for moving vertically and has a downstream projecting holding shoulder which has a horizontal transverse counter-blade-groove cooperating with the blade in a jaws lowered and closed position for cutting a portion of the sheath which is flexed between the shoulder and a clamp which presses an advanced segment of the sheath to a stacking table. The stacking table includes a vertically moveable pin carrier for impaling the severed end of a formed bag onto a transverse row of needles.

Abstract: An apparatus for stacking and delivering double bags of plastic film receives the bags from a transfer device at a stacking station which includes vertical pins on which the bags are impaled to form a stack. A stack conveyor with built-in grippers moves a completed stack to a severing station where a heated knife separates the double bags lengthwise of their travel while they are still in the grip of the grippers. The severed bags are then transferred to a delivery station where the grippers are released. The conveyor has separate side-by-side runs and separate gripper jaws are carried on each run. The stacking pins and the severing knife are located between the conveyor runs.

Abstract: The method of making from tube stock the bag pad arrangement of parent application Ser. No. 068,062 that is concerned with bagging a pair of liquid containers, such as containers for carry out for milk shakes, carbonated beverages, and other types of drinks, that are commonly available at fast food outlets, at the point of sale of such products, for easy and effective carry away by the customer, in which the bags of the bag pad are all the same and are incorporated in the pad in congruent relation.

Abstract: Bags are manufactured from a tubular web of thermoplastic film. An air injector periodically inflates the film whereupon it contacts cooperating vacuum plates. One of the plates has a cutting die which cuts a tab in the film which in turn provides an ingress for the injected air. The film is then sealed and severed to form the bags, which are then formed into a block. The tab then serves as an opening to facilitate the removal of individual bags from the block.

Abstract: A cutting apparatus for severing a sheath of thermoplastic material during a bag manufacturing operation. The cutting apparatus comprises a stationary frame (1) having a pair of timing pulleys (130, 131) mounted thereon which intermittently drive an endless timing belt (61) looped around the pulleys. The timing belt carries a cutter blade (56) across the width of the sheath during an intermittent cutting run for severing the sheath. The mid-portion of the timing belt is vertically displaceable by two pairs of vertically and horizontally spaced apart guide pulleys (135-138) supported on a vertically moveable frame (143, 71, 144) centered between the timing pulleys on the stationary frame. The vertically displacement of the mid-portion of the timing belt positions the cutter blade for the cutting run across the width of the sheath.

Abstract: This application discloses a method and apparatus for converting thermoplastic web material, flat or tubular, to produce bags. A conventional bag machine produces web segments provided with a group of centrally located holes and each segment is transferred by a conventional rotary transfer device to one of a plurality of platforms which are sequentially located at a stacking station. The platforms are provided with upwardly projecting pins on which the web sections are stacked. After the accumulation of a desired number of web segments on the platform located at the stacking station, the loaded platform is indexed away from the stacking station to a perforating station and then to a cutting or cutting and blocking station to thereby produce two bag stacks, each of which are retained on the associated platform by the pins.

Abstract: A bag pack of a plurality of stacked bags made from thermoplastic film, each bag comprising front and rear walls; a bottom; an open-mouth portion, said open-mouth portion being characterized by having handles which are integral extensions of said walls and located at opposite ends of said bag mouth portion. A single film tab member extends above each rear bag wall and above the open-mouth portion. The tab is coplanar with the rear wall and connected thereto through a localized line of film weakening. The tabs of all bags are in registration and are a collection of only tabs coplanar with said rear walls. The tabs are bonded together and include a suspension means to accommodate physical suspension of the pack.

Abstract: Disclosed is stacking arrangement for accumulating a plurality web segments of substantially identical dimensions on sharpened pins projecting upwardly from a support plate located at a stacking station. As each web segment is produced, it is firmly held or grasped on opposite sides of its medial area and impalled on and penetrated in the medial area by the sharpened pins. Release of the segment from the grasping force occurs after the segment has been penetrated by the pins.

Abstract: A stack of interlocked detachable bags, preferably formed from a thermoplastic foil strip, and each comprising two walls, a front wall and a back wall, preferably at least one handle-shaped incision positioned on one of said walls adjacent an upper filling opening, wherein the individual bags each have an interlock piece and are attached together with the aid of at least one interlock means engaging their interlock pieces, and by means of a row of perforations forming an edge of the interlock piece the individual bags are detachable from the interlocked stack by tearing off. On one of the walls of each bag adjacent an upper filling opening edge of that bag a reinforcing piece, preferably of plastic foil, with the interlock piece is attached so that the interlock piece protrudes above the filling opening edge. Advantageously the inside of the back wall is provided with the protruding interlock and reinforcing pieces.

Abstract: A machine for the manufacture and stacking of bags, pouches and the like made from a thermoplastic material in which the upper welding jaw and a belt driven angled cutting blade are mounted in fixed manner to the machine. The lower welding jaw is mounted for moving vertically and has a downstream projecting holding shoulder which has a transverse groove with stepped edges forming a blade support in the raised position of the lower jaw. A blocking shoe is provided a short downstream distance from the holding shoulder and has a blade spring member attached to a bottom surface which extends in an upstream direction toward the lower welding jaw. The blade spring operates to first tension the thermoplastic segment in the raised position of the lower jaw prior to the cutting by the transverse moving blade and then to deliver and hold the severed end of the formed bag on a resilient pad on the stacking table.

Abstract: A chain of plastic bags having zipper-locking profiles is compactly stacked in a rectangular carton in successive layers such that the bags of the chain lie flat in the carton and the zipper profile portions of successive bags in chain do not lie on top of one another by means of an automatic apparatus. The apparatus comprises an oscillating guideway for laterally depositing the bags of the chain in rows extending back and forth between opposed lateral sidewalls of the carton and a vertically movable lift table having a horizontally reciprocating platform on which the carton is disposed. The lift table operates to lower the carton beneath the guideway as the carton is being filled and to move the carton transversely of the guideway so that the zipper profiles of successive bag rows are disposed offset from one another.

Abstract: A method and apparatus for producing thermoplastic bags from an elongate web. Apparatus for feeding the web includes devices for producing mounting holes and perforations along a circular path surrounding the holes. The web is severed and sealed to produce sheets containing a mounting hole encircled by the perforations. A selected number of successive sheets are impaled on a post projecting through the holes. A stack having a selected number of sheets is accumulated on a post fixed to a support supporting a medial zone of the sheets which are combined by a heated punch penetrating the sheets in the area enclosed by the perforations.

Abstract: A thermoplastic bag structure having, in its lay-flat condition, a front and rear bag wall, a two-film heat seal bottom; the outer side margins of the full length of said bag being folded toward but spaced from each other. The top most edge of each fold is heat sealed through the four films thereof along line corresponding to the width of the folds. An open mouth top portion being characterized by having double film handle loops at opposite ends of said mouth, said double film loops being extensions of the folded regions of said bags and the corresponding regions of said front and rear walls. The bag structures can be unitized by providing a detachable tab at the bag mouth opening and unitizing the bag structures through this tab.

Abstract: This application discloses a method and apparatus for converting thermoplastic web material, flat or tubular, to produce bags. A conventional bag machine produces web segments provided with a group of centrally located holes and each segment is transferred by a conventional rotary transfer device to one of a plurality of platforms which are sequentially located at a stacking station. The platforms are provided with upwardly projecting pins on which the web sections are stacked. After the accumulation of a desired number of web segments on the platform located at the stacking station, the loaded platform is indexed away from the stacking station to a perforating station and then to a cutting or cutting and blocking station to thereby produce two bag stacks, each of which are retained on the associated platform by the pins.

Abstract: A machine for making a unitized stack of vest type bags from a tubular plastic web comprising, essentially, a horizontal frame (1) adjoining at one end a unit for unwinding the plastic film (2) in an intermediate portion supporting transversal rollers (3) and a cutter unit (4), the former for pulling the film (2) and the latter for cutting out the straps of the bags. At the opposite extremity of the frame (1) there is provided a sealing and cutter unit (5) at the outlet of which there is disposed a bundling and ejector unit (6) to accomplish the bundling of various bags for forming and ejecting blocks of bags. The bundling and ejector unit (6) has a sealing table (7) interposed between a tilting vane (8) and a tilting table (9). Sealing electrodes in the shape of pins (12) perform the sealing of various bags making up a block and alongside of which are needles (13) to stabilize the bags on the table (7).

Abstract: A binding machine for binding together a stack of individual bags to form a pad of bags by connecting the bags together at corresponding selvage portions adjacent the mouths of the bags, comprising a reciprocable side sealing means and, optionally, a reciprocable rear edge sealing means, a conveyor for the bags that is optionally movable either from front to rear of the machine or laterally of the machine, stop means for holding the stack of bags in a predetermined position for binding, and means for timing the reciprocable sealing means and the stop means to permit continuous but intermittant progression of a plurality of stacks of bags through the sealing cycle.

Abstract: Apparatus for aligning a wicketer frame with an edge of a tubular or semitubular plastic web. The positions of the edges of the web are sensed and the wicketer frame is transversely displaced in response to and in dependence on the sensed deviation of the edges of the web from an initial position. The wicketer frame is provided with at least one transverse rail, which is supported on rollers or sliding surfaces of an underlying carrying frame to permit transverse movement of the wicketer frame relative to the web. The wicketer frame is connected by a beam to an end frame, which carries the downstream end of a stacking conveyor and is supported on a base frame. The end frame is longitudinally displaceable and is rotatable through a small angle relative to the base frame. A rack and pinion arrangement is provided for transversely moving the wicketer frame.

Abstract: The delivery suction arms of a transfer mechanism take the individual plastic bag segments to be stacked from a welding and cutting station, swing them to a pin conveyor belt and spindle them on the stack pins of the pin conveyor belt. Three suction arms are positioned next to each other in rows with spacing from each other, two of which grasp an individual plastic bag segment on both sides of pin holes positioned at one end of the individual plastic bags, and in stacking swing past the pin conveyor belt. The remaining or third delivery suction arm grasps the bottom of the individual plastic bag. In the travel direction of the conveyor belt a finishing mechanism is positioned following the delivery mechanism which seals the stacked bags and may provide the bags with handle-holes.

Abstract: Apparatus for stacking and conveying flat articles that are preferably provided with locating holes and preferably consist of bags that have been severed from a tubular or semitubular plastic film web and have been closed by welding. The bags are carried from a forming station to a pair of adjacent, parallel stacking conveyors by a rotatable wicketer having spaced pairs of radial transfer arms. The stacking conveyors include endless belt like carries that pass around rotatable wheels or rollers and are intermittently driven. The carriers include upstanding stacking pins or stacking needles, which extend from and are secured to carrying plates mounted on the carriers. Two spaced, adjacent stacking conveyors are provided and different tools for acting on the intermittently conveyed stacks of bags are selectively provided and detachably secured to the frame of the apparatus between the stacking conveyors.

Abstract: There is disclosed a bag making machine for producing bags from an elongate strip of plastic web material. The disclosure relates to various improvements in the bag making machine such as the apparatus for forming the bag handle. This apparatus includes a stationary cutter and movable support plate for moving the web material into cutting engagement with the cutter. A novel reciprocal drive mechanism and coupling device are employed.

Abstract: A folding device for folding a web material made of plastics or the like to a predetermined length in a Z-shaped manner. In this device, a web material is guided around folded end holding members, which are suitably, linearly movable to and from respective folding end positions of the web material, by means of a feed mechanism for feeding the web material while the feed mechanism reciprocates between both folded end positions, so that the web material can be folded in a Z-shaped manner.

Abstract: Disclosed is a method and apparatus, associated with a rotary transfer device having a plurality of radially extending circumferentially spaced arms, for flattening and maintaining thermoplastic web segments or bags in a flat condition at a pick-up or transfer station so that successive segments or bags are being engaged and transferred by the arms of the transfer device are free of folds or wrinkles and thus insure proper stacking on one or more upwardly extending posts at a stacking station.

Abstract: An apparatus for making bags from a multilayer synthetic-resin strip workpiece has a vertically displaceable upper welding element which has an upper upstream welding tool extending across the strip and an upper downstream welding tool generally parallel thereto, and a blade fitted in the tool element to project downward from the upper tools.

Abstract: The stacker provided in the stacking station immediately downstream of the cutting station of the bag making apparatus includes a transversely reciprocal needle bar provided with a plurality of needles including at least one heated blocking needle and a transversely reciprocal stripper bar through which the needles engaged. The upstream end of each bag blank is pierced by the needles as it is cut off the tube, with the downstream portion of each bag blank lying on one of the conveyor platforms. Periodically the stripper bar is moved upwardly to strip an entire stack of bag blanks off the needles. A flattening device having flattening elements engages each of the bag blanks as it cut free from the tube and presses it flatly down against the stack on the platform.

Abstract: An apparatus for making bags from a multilayer synthetic-resin strip workpiece has a transport device for conveying the workpiece longitudinally in a transport direction along a path, a lower welding tool along the path beneath the upper tool, and a heater for at least one of the tools. A conveyor belt extending along the path downstream of the tools has a horizontal conveyor surface positioned to receive the workpiece after same is conveyed by the transport device past the welding tools. A holddown roller rotatable about a horizontal axis is displaceable vertically above the conveyor surface. A drive connected to one of the welding tools and to the transport device, conveyor belt, and holddown roller generally synchronously vertically and codirectionally displaces the one welding tool and the holddown element and synchronously horizontally and codirectionally displaces the conveyor surface and holddown element.

Abstract: An apparatus and method of forming individual sealed plastic bags from a continuous web of a layflat tubular film material wherein the individual plastic bags, subsequent to the formation of bag seals and the separation of the film web into individual plastic bags, are intermittently and sequentially conveyed through a cooling zone which will allow for the cooling of the bag seals. Thereafter, the bags are serially conveyed to a bag stacking arrangement incorporating a stacker foot which will position the first or bottom bag of a stack being formed on a vacuum box which retains the bag in a fixed position and with subsequent bags being superimposed on preceding deposited bags and sealed thereto through the intermediary of heated needles depending from the stacker foot which will penetrate and concurrently seal the bags together at predetermined locations.

Abstract: An improved stop plate and belt assembly for the stacking section of a corrugated box machine and an improved system for conveying corrugated boxes from the folding section to the stacking section of a corrugated box machine.

Abstract: The invention is embodied in bag-making apparatus wherein a tubular web of thermoplastic film is intermittently advanced, in bag-length increments. In the dwell between successive advances, there is a cycle of sealing, cut-off and stack accumulation, the accumulation being onto needles to form a stack.The needles comprise a single group, forming part of a single transfer mechanism, operative (a) to transfer to a conveyor each successive needled stack, into partially lapped relation with the previously transferred stack, (b) to disengage its needles from the transferred stack, and (c) to return the needles to normal needling position, for anchored accumulation of bags as they are formed for the next stack.

Abstract: A bag forming machine of the top stacking type has means at the stacking station whereby a stack (12) of bags are clamped during high acceleration arising in their transfer from the stacking position at the station to a discharge conveyor (11). By employing high accelerations and clamping the stack can be transferred without interrupting the rhythm of delivery of bags to the stacking station. The bags are clamped at their "cut" ends by a first clamp (14, 15) during stacking and are then clamped at a second clamp (22, 24), moving transversely to the stack so as to apply dragging motions to the stack to move the "cut" ends of the bags away from the first clamp and to present the "weld" ends of the bags at a roll nip (30, 31) which feeds to the conveyor.

Abstract: An apparatus for making bags from a multilayer synthetic-resin strip workpiece has a transporter for conveying the workpiece longitudinally in a transport direction along a path, an upper vertically displaceable welding element along the path having relative to the direction an upper upstream welding tool extending across the path and generally parallel thereto an upper downstream welding tool, and respective vertically displaceable lower upstream and downstream welding tools vertically aligned with the upper upstream and downstream tools. A blade extends transverse to the path between one of the upstream tools and the respective downstream tool. Displacement together of the tools with a workpiece between them welds the workpiece together along upstream and downstream seams at the respective tools and cuts the workpiece across with the blade between the seams, and away from one another frees the severed downstream end section of the workpiece.

Abstract: There is described a device for collecting bags, to be associated with a machine for manufacturing or filling bags one by one, particularly plastic bags which are each provided along the one edge in parallel relationship with the bag-movement direction inside said machine, with a hook which projects relative to said bag and the opening of which faces the collecting device, which comprises a fixed rod facing downwards, which is arranged in the path of the bag discharged from the machine outlet and with such a spacing therefrom that said rod enters the bag hook opening when the bag is moving, the rod cross-section being smaller than the inner cross-section of said hook to let those hooks which are slipped over said rod, slide along same to have the bags pile up by gravity on the rod, means being provided on said rod with such an arrangement as to prevent the bag hooks falling by gravity from the lower free end of said rod.

Abstract: In a transverse severing apparatus for webs of thermoplastic material, two parallel pressure bars are lowerable onto and raisable from a section or sections to be severed from the web. The upstream pressure bar clamps the leading end of the web to a backing bar. The second pressure bar, which is disposed between a severing knife and the upstream bar, tensions the web clamped between a pair of feed rollers and the upstream pressure bar before the severing knife cuts the web.

Abstract: A continuous web in the form of a hose-like thermoplastic foil is intermittently fed through a welding and severing station in which two transverse weld seams on the foil are made and simultaneously a cutting blade severs a completed bag along a line between the weld seams. A transfer unit arranged immediately below the welding station temporarily seizes the severed bag, displaces the same a small distance in feeding direction, and then dashes the rear portion with the still plastic weld seam against an alignment line of a stacking station. The stacking station is arranged a small distance below the welding station at the other side of the severed bag, and the still plastic weld seam fuses with the corresponding weld seam of the preceding bag interlocked in the stack. The completed stack is discharged in a perforating station where the tearing line is perforated simultaneously through all stacked bags. If desired, additional holes are punched between the upper edge of the bag and the perforation line.

Abstract: A length of woven plastic fabric in tubular form is advanced from a source of supply while telescoped over a separator plate which maintains the two plies of the tubular stock in separated relation. A heated knife blade aligned vertically with the downstream end of the separator plate is reciprocated vertically to sever the tube stock into bag blanks. The severed edges on the upstream side of the heated knife remain separated rather than being heat sealed together by the heated blade. The severed blank is impaled on needles mounted on an endless chain which conveys the blanks laterally through a sewing machine and/or a sealing mechanism for securely closing one end of the blanks. Thereafter successive blanks are conveyed to a stacking device which disengages the blanks from the needle chain and stacks them horizontally one upon another.

Abstract: A binding machine for binding together a stack of individual bags to form a pad by connecting the bags together at the overlapping selvage portions thereof adjacent their mouths, comprising a vertically movable actuating means having a cutting means and side sealing means operatively connected thereto, whereby as the actuating means moves toward a platform adapted to support a stack of bags, the cutting means and the side sealing means move together to both perforate and form side seals at the overlapping selvage portions of the bags, the machine also being provided with end sealing means that are optionally operated in conjunction with the vertically movable actuating means to form end seals on the selvage portions of the stack of bags.

Abstract: The invention relates to stacking flat articles, such as tube sections, bags or sacks, with two spaced apart hubs arranged to rotate in synchronism on a horizontal axis and carrying respective spiders, the arms of which are equally angularly spaced and on their leading sides, in the sense of rotation, carry suction nozzles, with a receiving or carrying conveyor for the article disposed between the arms adjacent to the horizontal plane which contains the horizontal axis and protrude beyond the articles to such an extent that the side edges of the articles extend, at least in part, to the planes in which the arms are rotatable. A series of needles are disposed on the side of the axis which is opposite to the receiving conveyor and are closely spaced from the arms of one of the spiders and extend approximately parallel to that one of the arms which is in a vertical position, to enter perforations of the articles as the articles are delivered by the arms.

Abstract: In a method of stacking sacks of thermoplastic film, the sacks are successively deposited on each other and formed with internested loops of progressively shallower depth.

Abstract: A bag-making machine is disclosed for producing bags from thermoplastic web material. A device (86) for grasping and transferring web segments in an arcuate path for reception by an accumulating device (88) serves to grasp adjacent opposed edges and transfers them through an arc to an accumulating device which includes posts (90).Accumulation of web segments occurs on a bag stack accumulating and transporting device located between laterally spaced radially projected arms of the web transfer device and it includes an indexing system (94) for translating the stacking posts away from the stacking station. The web segments are subsequently cut and/or joined along a line located centrally of the web segments at a station (102) to thereby produce two individual stacks of bags.This invention relates to a method of and apparatus for producing thermoplastic bags.