Abstract: A hole cutter is provided for a thermoforming packaging machine. The hole cutter uses a single actuator to move a row of film-cutting punches between extended and retracted positions for cutting holes and corresponding chads in a marginal film area of a web of thermoformed product packages.

Abstract: An apparatus is provided for cutting holes and slicing through a web of formed, filled and sealed product packages in a thermoforming packaging machine. The apparatus uses a single actuator to move a row of film-cutting punches between extended and retracted positions for cutting holes and corresponding chads in a marginal film area of the web of thermoformed product packages and a cross cut knife to slice through the marginal film area to separate rows of the thermoformed product packages.

Abstract: The invention relates to a device for transporting objects, in particular packaging means, said device comprising a continuous conveying section (3) and a plurality of conveying assemblies (40) that circulate on the conveying section (3). Each conveying assembly (40) comprises a first conveying element (4) and a second conveying element (5) and each of said conveying elements (4, 5) can be driven individually and independently of one another. The conveying elements (4, 5) are designed to jointly transport one individual object (2).

Abstract: An apparatus for making a capsule provided with a shell containing a filtering element suitable for receiving a product for preparing a beverage or the like includes a superimposing assembly for applying a film of filtering material to at least one shell with a cavity in order to cover an opening of the cavity. The shell is moved along a first advancement direction and the apparatus further includes a locking assembly to lock the film to the shell, and a first stretching device included in a first stretching station for heating and stretching a portion of the film facing the cavity in order to obtain a filtering element.

Abstract: Automatic packaging machine (10) for continuously packaging products (P) each wrapped in a single envelope (B), comprising a conveyor (12) that defines a conveying plane (PT) for conveying a continuous sheet (F) of packaging material, in particular paper, along a conveying direction (DT), said conveying plane (PT) comprises an entrance end (12a) of the continuous sheet (F) and an exit end of a plurality of envelopes, each containing a product (P), in which the entrance end (12a) is associable with a feeding unit of a plurality of products (P) in succession one after the other and at a distance one from another on the continuous sheet (F) fed on the conveying plane (PT), a feeding unit (18) of the continuous sheet (F) on the conveying plane (PT) and that feeds the continuous sheet (F) along a feeding plane (PA) that extends below the conveying plane (PT), is orthogonal or substantially orthogonal to the conveying direction (DT) and is defined at the entrance end (12a) of the conveying plane (PT), wherein the c

Abstract: A tag applicator, and a method, for applying a tag, having an elastic loop, to a product. The tag applicator includes a linear actuator, and a pair of tag arms, one end of each being pivotably connected to the linear actuator. The two arms are biased toward each other, such as by a spring. A separator is positioned between the tag arms, so as to force the tag arms to separate as the linear actuator extends. A finger or tag hook is connected at the end of each tag arm, configured and positioned to connect to or insert into the elastic loop, and to extend the elastic loop as the tag arms are separated. With the tag loop held open, the product moves into the loop, and the tag is thereby applied to the product.

Abstract: A method and device for producing bundle packages, in particular bundle packages (10) for cigarettes (cigarette carton 11), wherein a group of packs (12), in particular cigarette packs, is encased in an outer casing (13) to form the bundle package (10), and wherein the packs (12) respectively exhibit a code (19), in particular a barcode, and the group of packs (12) is encased in the outer casing (13) such that the code (19) of the packs (12) is not concealed by the outer casing (13) and that a means (20, 23) for concealing the code of the packs (12), in particular a pre-cut piece (20), such as an (adhesive) label, and a code (21) for the bundle package (10) are subsequently arranged on the bundle package (10).

Abstract: A foldable and flexible carrier which may include a polymeric form that is foldable to provide a carrier having sufficient strength to securely hold and carry items while maintaining position about the items and which can be assembled without fastening hardware.

Abstract: A device and method for shipping and display of already packaged goods which provides support for packages, and which allows a uniform orientation of those packages, as well as retaining those assembled packages at a uniform distance from other products. The substrate comprising this device has adhesive or other materials to make packages adhere to the substrate, and also has adhesive materials to make the substrate itself adhere to another surface such as a retail shelf. The packages are placed for shipping or display on one side of the substrate and are held in a fixed position, while the substrate itself is placed on another surface so that the packages may be uniformly stacked or observed. The adhesive, or other material causing adhesion, is stronger on the side allowing adhesion of the device to another surface, and weaker on the other side which holds the packages in a fixed assembly. Thus, when a single package is removed from the device, the device itself remains adhered to the other surface.

Abstract: A paper sheet bundling apparatus includes a bundling unit 22 configured to bundle bundling target paper sheets using a bundling band and make a batch of paper sheets, a stamp affixing unit 71 configured to affix a stamp to the bundling band of the batch of paper sheets, a memory unit 180 configured to store therein an association between the kind of paper sheet and a stamp affixing position on the bundling band or the paper sheet, and a control unit 170 configured to obtain a stamp affixing position corresponding to the kind of the bundling target paper sheets with reference to the association, and adjust a positional relation between the stamp and the bundling band or the batch of paper sheets at a time of affixing the stamp, on a basis of the obtained stamp affixing position.

Abstract: A continuous sealing device includes: a first roller, having a first circumference, where the first circumference includes a first heat sealing segment; a first heating member, located at the first heat sealing segment, where when the first roller rotates, the first heating member bonds film sheets in a heat sealing manner to form a first bonding segment; a second roller, having a second circumference, the second circumference includes a second heat sealing segment; and a second heating member, located at the second heat sealing segment, where when the second roller rotates, the second heating member bonds the film sheets in a heat sealing manner to form a second bonding segment, and the first bonding segment and the second bonding segment are connected to form an uninterrupted heat sealing wire on the film sheets.

Abstract: A collapsible bladder system for the storage and disposal or re-use of cement returns from oil and gas wells is described. The collapsible bladder system includes a flexible storage bag having an input valve, an output valve and a vent that can be easily set up and transported by a single person. Cement returns are pumped into the flexible storage bag and allowed to harden into a cement block. The cement block covered with the storage bag can be hauled away for disposal or re-used for a secondary purpose, such as a barricade.

Abstract: An apparatus for dispensing sorbent canisters into containers includes a first wheel and a second wheel, disposed to rotate with each other. A first plate is disposed between the first and second wheels and a second plate is disposed on a side of the second wheel opposite the first wheel.

Abstract: A lubricant applicator unit for pressure relief valves for a system for applying pressure relief valves to packaging during a packaging process, including a vacuum applicator for temporarily separating layers of the valve when the lubricant is applied. A pressurized nozzle sprays or atomizes the lubricant into the valve opening. Graphite suspended in liquid silicone is used as the lubricant; it is recirculated in a reservoir to keep the graphite in suspension. Optical sensors check for valves before the entrance to, and after exit from, the vacuum applicator.

Abstract: One provides (101) a plurality of one-way degassing valves (202) that are to be installed on corresponding containers and places (102) a viscous liquid (such as silicon oil) (205) in each of the plurality of one-way degassing valves to provide a corresponding plurality of installable one-way degassing valves (208). These teachings then provide for automatically and non-destructively determining (103), prior to installation of these valves on the corresponding containers, whether the viscous liquid has been properly placed. By one approach, this can comprise using a captured image (210) of at least a portion of each such one-way degassing valve to make this determination.

Abstract: A method of separating opening devices supplied jointly in the form of a sheet and applied individually to respective packages of pourable food products involves feeding the sheet, which has a number of parallel rows of opening devices integral with one another, to a first station where a first row is detached from the rest of the sheet. The first row is fed to a second station where it is divided into individual opening devices, and a following second row of the sheet is fed to the first station as the preceding first row is being fed to the second station and/or is being at least partly divided.

Abstract: A device for feeding a web of a packaging material along a path and towards an application station; wherein the packaging material comprises a plurality of pre-laminated holes at which application station applies respective opening devices. The device comprises an advancing mechanism for advancing the web along a first direction parallel to path; a sensor for generating a plurality of measure signals associated to the positions of pre-laminated holes; and a first motor controllable on the basis of measure signals. The first motor is operatively connected to the advancing mechanism for moving the advancing mechanism along a second direction transversal to path.

Abstract: A system for applying pressure relief valves to packaging from a liner carrying adhesive backed pressure relief valves passing over a series of rollers in tension onto a peeler bar. There is a valve applicator unit proximate the peeler bar with a punch shaft and an applicator shaft with an applicator vacuum head. The liner is moved by a retraction unit including clamping members that alternately maintain the liner stationary under tension and pull the liner under tension to advance the liner carrying adhesive backed pressure relief valves. A supply reel for a roll of liner carrying adhesive backed pressure relief valves has a pair of spaced apart plates and a pair of rings with a non-stick coating positioned between each of the plates and the roll of liner. The plates, rings and roll of liner are compressed together by an adjustable retainer.

Abstract: An apparatus for use in the formation and filling of a pouched product.

Abstract: A pneumatic container transport system conveys specialized, cylindrical containers between stations within an automated container filling system. Low-pressure, high-velocity air moving through plastic tubing propels the containers through switching gates, air impellers and deceleration devices from one station to another. Annular ridges around the circumference of the containers minimize contact with the inside tube walls and deter scuffing of paper labels which carry machine-readable indicia upon which the container filling system relies for directing the containers. The air impellers include pressure relief means for adjusting the air pressure and velocity. Actuator-operated gates in the tubing system respond to control signals from management software to direct each container to its next station. At selected stations, decelerators slow the containers upon arrival to cushion their impact upon arrival and to protect the contents from damage due to jarring.

Abstract: A strip pack device is adapted to manufacture a strip-pack product having an article attached to a strip. The strip pack device includes a conveying part, a drawing-in part, a moving part and an attachment part. The drawing-in part is configured and arranged to draw a front end of the article conveyed by the conveying part to a predetermined position. The front end is located frontward in a conveying direction. The moving part is configured and arranged to receive the article at the predetermined position in the drawing-in part, to move the article from the predetermined position in a generally opposite direction of a draw-in direction of the drawing-in part, and to move the article to an attaching position. The attachment part is configured and arranged to attach the front end of the article to the strip after the article has been moved to the attaching position.

Abstract: A device and method for adding information on the outer surface of articles, such as containers in a container filling plant. The abstract of the disclosure is submitted herewith as required by 37 C.F.R. §1.72(b). As stated in 37 C.F.R. §1.72(b): A brief abstract of the technical disclosure in the specification must commence on a separate sheet, preferably following the claims, under the heading “Abstract of the Disclosure.” The purpose of the abstract is to enable the Patent and Trademark Office and the public generally to determine quickly from a cursory inspection the nature and gist of the technical disclosure. The abstract shall not be used for interpreting the scope of the claims. Therefore, any statements made relating to the abstract are not intended to limit the claims in any manner and should not be interpreted as limiting the claims in any manner.

Abstract: A method and apparatus are provided for attaching a safety cutting blade onto a substrate, such as a cardboard blank. A piece of cutting blade material is cut to length and fed to a forming station that bends the piece to form a safety cutting blade having a plurality of cutting teeth. The cutting blade is fed to a crimping station where the cutting blade is mated with a substrate and affixed with the substrate. A transport then conveys the combined cutting blade and substrate away from the crimping station.

Abstract: A method of separating opening devices supplied jointly in the form of a sheet and applied individually to respective packages of pourable food products involves feeding the sheet, which has a number of parallel rows of opening devices integral with one another, to a first station where a first row is detached from the rest of the sheet. The first row is fed to a second station where it is divided into individual opening devices, and a following second row of the sheet is fed to the first station as the preceding first row is being fed to the second station and/or is being at least partly divided.

Abstract: A method of forming and filling a pouch, comprises forming opposing walls of a film; sealing the opposing walls of film together to form at least one pouch; filling an interior section of the at least one pouch through an opening in an upper portion of the at least one pouch with a flowable material; forming a top sealed expressing-shaped region to close the opening in the at least one pouch; and cradling the pouch with a foldable flat that is more rigid than the pouch that can be folded or rolled to compress the pouch to express the flowable material through the expressing shaped region.

Abstract: A beverage bottling plant for filling bottles with a liquid beverage material having a filling machine. The abstract of the disclosure is submitted herewith as required by 37 C.F.R. §1.72(b). As stated in 37 C.F.R. §1.72(b): A brief abstract of the technical disclosure in the specification must commence on a separate sheet, preferably following the claims, under the heading “Abstract of the Disclosure.” The purpose of the abstract is to enable the Patent and Trademark Office and the public generally to determine quickly from a cursory inspection the nature and gist of the technical disclosure. The abstract shall not be used for interpreting the scope of the claims. Therefore, any statements made relating to the abstract are not intended to limit the claims in any manner and should not be interpreted as limiting the claims in any manner.

Abstract: The invention relates to a continuous band for producing bags for fruit and vegetable products, formed from a continuous plastic sheet (1) which has been die-cut to produce a series of small holes (3) which are closed using mesh or net fragments (4) fixed along the periphery of said holes by means of heat-sealing, gluing or any other conventional means. According to the invention, the area of the continuous sheet (1) intended to contain the handle is provided with a transverse patch (5) of pre-determined hardness in order to reinforce the area used to hold the bag once it has been filled, such that the thickness of the band-forming plastic sheet can be significantly reduced, specifically by a value of the order of 40%, without affecting the performance of the bag in terms of mechanical strength since the area in which the greatest strains are concentrated corresponds exactly to the area containing the handle.

Abstract: A container has a base panel, at least one side panel extending upwardly from the base panel, and at least one end panel extending upwardly from the base panel. At least one corner is formed at a junction between the side panel and end panel. A flange extends laterally outward from the upper edges of at least one of the side panel, end panel, and corner. An injection-molded structure extends along at least a portion of the flange, the injection-molded structure includes a base portion adjacent the upper edges of the side wall and the end wall, a distal portion extending laterally outward from the base portion, and an indentation in the distal portion extending along at least a portion of the flange of the container. An apparatus for forming the container and a method of manufacturing are also disclosed.

Abstract: A medicine delivering device permits additional medicine cassettes to be provided at low cost without greatly enlarging the installation space. The medicine delivering device includes a medicine storage and removal unit in which many medicine cassettes each containing a medicine are detachably provided to the outer surface of a drum whose upper and lower ends are rotatable supported by the device body and a medicine packaging unit that packages medicine removed through a collecting hopper from the medicine cassette of the medicine storage and removal unit. There is provided on the side surface of the device body a sub medicine storage and removal unit including: a body; a drawer body provided to be capable of being pulled out from the body and that is detachably provided with a plurality of medicine cassettes each containing the medicine; and a guide that guides the medicine taken out from the medicine cassette to the collecting hopper.

Abstract: A stream of products is packaged and biologically treated by the system. The system has an index conveyor with a filling station and a packaging station. Discrete packages are filled with the stream of products, sealed and moved on an index conveyor. The system moves the discrete packages an irradiation chamber at a steady rate on a continuous speed conveyor. A controller matches the cyclical rate of the index conveyor with the steady rate of the continuous speed conveyor and uses a buffer to transition from the cyclical rate to the steady rate.

Abstract: The invention relates to a packaging machine for packing food products in a plastic packaging, said machine comprising a device for applying a transponder to the plastic packaging, and a system for data exchange between the transponder and a computer unit and/or a regulating unit, by which means data can be transmitted to the transponder or called therefrom.

Abstract: A method for applying pressure relief valves to packaging during the packaging process. A punch shaft and an applicator shaft each have an axis and opposed ends. The punch shaft has a punch at one end. The applicator shaft has an applicator vacuum head at one end. Each shaft moves axially between retracted and extended positions. The shafts are angled, with the punch and applicator ends more apart than the respective opposed ends, and are carried on a plate for limited rotational movement relative to the applicator unit. First the punch is pivoted from a first position into a third position, while the applicator head is simultaneously pivoted from a second position into the first position. Then the punch is pivoted from the third position back into the first position, and the applicator head is simultaneously pivoted from the first position back into the second position.

Abstract: An automatic system for the delivery and distribution of articles in groups comprises a store of articles, a unit for the collection and delivery of articles from the store and a controller associated with the collection and delivery unit in order to control the selective collection of articles from the store and their output as sets of articles logically grouped together. The system further comprises a grouping device which receives the sets of articles logically grouped together as inputs and outputs corresponding packs, groups or bundles of articles physically connected to one another by a restraining loop or strip.

Abstract: A method for applying pressure relief valves to packaging during the packaging process. A punch shaft and an applicator shaft each have an axis and opposed ends. The punch shaft has a punch at one end. The applicator shaft has an applicator vacuum head at one end. Each shaft moves axially between retracted and extended positions. The shafts are angled, with the punch and applicator ends more apart than the respective opposed ends, and are carried on a plate for limited rotational movement relative to the applicator unit. First the punch is pivoted from a first position into a third position, while the applicator head is simultaneously pivoted from a second position into the first position. Then the punch is pivoted from the third position back into the first position, and the applicator head is simultaneously pivoted from the first position back into the second position.

Abstract: The present invention is a novel, theft-resistant, and senior-friendly packaging for consumer and retail products that is cheap and easy to manufacture. The packaging is designed to prevent individuals from gaining access to the enclosed product through tampering with the packaging while at the same time meeting or exceeding federal child-resistant and senior-friendly guidelines. The packaging incorporates plastic material and multiple cuts to be tear-resistant and to halt the propagation of a tear, if one should occur.

Abstract: An applicator unit for a system applying pressure relief valves to packaging during the packaging process. A punch shaft and an applicator shaft each have an axis and opposed ends. The punch shaft has a punch at one end. The applicator shaft has an applicator vacuum head at one end. Each shaft moves axially between retracted and extended positions. The shafts are angled, with the punch and applicator ends more apart than the respective opposed ends, and are carried on a plate for limited rotational movement relative to the applicator unit. First the punch is pivoted from a first position into a third position, while the applicator head is simultaneously pivoted from a second position into the first position. Then the punch is pivoted from the third position back into the first position, and the applicator head is simultaneously pivoted from the first position back into the second position.

Abstract: A device for sealing filter bags for products for infusion, where each filter bag is made from a flat web (1) of filter paper and has applied to it a tag (1b) and a tie string (1a) connecting the tag (1b) to the filter bag itself, comprises at least: a sealing sonotrode element (3) positioned so that it faces a first path (P) along which the flat web (1) is fed and so as to seal the string (1a), which is arranged according to a defined pattern, and the tags (1b) to each other and to the flat web (1) of filter paper'.

Abstract: An applicator unit for a system applying pressure relief valves to packaging during the packaging process. A punch shaft and an applicator shaft each have an axis and opposed ends. The punch shaft has a punch at one end. The applicator shaft has an applicator vacuum head at one end. Each shaft moves axially between retracted and extended positions. The shafts are angled, with the punch and applicator ends more apart than the respective opposed ends, and are carried on a plate for limited rotational movement relative to the applicator unit. First the punch is pivoted from a first position into a third position, while the applicator head is simultaneously pivoted from a second position into the first position. Then the punch is pivoted from the third position back into the first position, and the applicator head is simultaneously pivoted from the first position back into the second position.

Abstract: The vertical form fill and seal (VFFS) machine is configured to place a fitment, such as a spout, on the longitudinal fin seal of a container. The fitment dispatched from a vibratory bowl via an adjustable track. The fitment is then secured to the edges of the film by longitudinal sealing bars and the edges of the film are likewise secured to each other by the longitudinal sealing bars sealing bars thereby forming a longitudinal fin seal. Depressions are machined in the machine direction center of the sealing bars in order to accommodate the shape of the fitment. The film is drawn over an oversized collar and an undersized tube so as to create excess film in order to form gussets providing a stand-alone capability.

Abstract: A machine for winding and boxing wound coils of filamentary material having a payout hole extending from the outer to the inner coil winding wherein a turret mechanism mounting two oppositely disposed end forms and corresponding collapsible mandrels and operative between first and second stations, wherein the first station enables filamentary material to be wound on one of the mandrels and associated end form and a second station wherein the mandrel and end form containing the wound coil is rotated to confront a boxing station; a boxing station including a platform having a movable back panel, a base panel and an inclined ramp facing the second station and being movable towards and away from the second station for receiving the wound coil from the collapsible mandrel; the boxing station receiving an unfolded box deposited on the base panel with a back panel folded against said back panel and including means for folding two opposite side panels of the box to enable reception of the wound coil in the partially

Abstract: A flexible pouch with a self-contained straw for packaging a product includes a front panel and a back panel each having an upper edge, a lower edge opposite the upper edge, and side edges extending therebetween the upper and lower edges. A straw is disposed inside the pouch at an angle between an upper corner of the pouch and an opposite lower corner. The pouch includes a first seal applied to the upper corner of the pouch to form a pocket for holding an upper end of the straw, and a second seal extending along the unsealed portion of the upper edge of the pouch to close the pouch. A method of forming and filling a flexible pouch with an integral straw includes the steps of forming each of the panels and joining two panels by sealing together their side edges and lower edge to form the pouch. The method also includes the steps of opening the pouch and inserting the straw into the pouch by positioning the straw at an angle between an upper corner of the pouch and an opposite lower corner.

Abstract: A sealable sterilising material for packaging medical devices requiring sterilization, has an average burst strength not less than 200 kPa measured according to ISO 2758 standard, an average tear strength not less than 300 mN measured according to the European standard 21974, an average impact strength not less than 0.4 J measured according to the ASTM standard and a bacterial filtering efficiency (BFE) not less than 85%, with a basic weight ranging between 40 and 250 g/m2, preferably between 90 and 250 g/m2, measured according to the ISO 536 standard and includes at least two sterilising packaging sheets (F1) and (F2), one of them at least being sealable directly or after being coated with a sealing product. The sheets are bound irreversibly together by one of their surfaces. The invention also concerns a package made from the material.

Abstract: An apparatus for adhering a sanitary member to a can lid includes an impressor head. The impressor head includes a base. A tooth descends from the base and is shaped in size and configuration to be received in fitting relationship with the inner rim wall and/or the recess of a can lid. A member having a diameter greater than the diameter of the rim of the can is disposed tautly and flatly across at least a portion of the rim of the can and then impressor head is moved towards the can lid through the member so that the tooth is received in fitting relationship with the entire surface of the can lid which may or may not include a countersink of the can lid with a film member disposed between the recess, the tooth and a side wall of the rim.

Abstract: Packs of rod-shaped smokers' products comprise containers of a material which permits monitoring of their contents by a suitable detector serving to generate signals which indicate the presence of characteristic indicia on one or more packed smokers' products. Such signals are encoded and the encoded information is applied to the respective containers. The information can be decoded and compared with signals furnished by the detector in order to ascertain whether or not the smokers' products are genuine, i.e., made by the manufacurer whose trademark(s) and/or other identifying information appear or appears on the containers.

Abstract: Packs of rod-shaped smokers' products comprise containers of a material which permits monitoring of their contents by a suitable detector serving to generate signals which indicate the presence of characteristic indicia on one or more packed smokers' products. Such signals are encoded and the encoded information is applied to the respective containers. The information can be decoded and compared with signals furnished by the detector in order to ascertain whether or not the smokers' products are genuine, i.e., made by the manufacurer whose trademark(s) and/or other identifying information appear or appears on the containers.

Abstract: Method for packaging products being prone to decay, such as food products, more particularly vegetables and/or fruit in a synthetic foil, wherein the synthetic foil is perforated in an operation step, converted into a package and filled. The foil is thereby conveyed through a punching device, whereby perforations are punched in the synthetic foil, the perforated synthetic foil is formed as packages having the desired dimensions and these packages are filled with the products and closed.

Abstract: A system for automatically packaging photosensitive rolls includes a flanged member installing device for selecting flanged members corresponding to a photosensitive roll and automatically installing the flanged members respectively on opposite ends of the photosensitive roll, a tape member applying device for automatically applying a joint tape to an end of the photosensitive roll, a packaging sheet working device for automatically processing light-shielding leaders to dimensions corresponding to the photosensitive roll, an applying mechanism for automatically applying the processed light-shielding leaders to the photosensitive roll, and a packaging sheet takeup device for automatically winding the light-shielding leaders around the photosensitive roll.

Abstract: A material in the form of a sheet for enveloping a bale of agricultural material is coated with or contains a preservative in order to prevent spoilage of wrapped bales of agricultural material by aerobic organisms.

Abstract: An elevator device in a machine for forming packs of rolls includes an auxiliary plate member, situated between wrapping sheet folders and a constraining plate of a conveying line. The auxiliary plate member moves vertically between a lower end position near and above the folders, and an upper end position in alignment with the constraining plate. When an elevation plate is raised to push a group of rolls partially wrapped with a wrapping sheet against the constraining plate, the auxiliary plate member keeps the rolls and the sheet firm and is moved synchronously with the plate thus carrying the group of rolls and the sheet upwards until they are received within holding means of a conveying line.

Abstract: The present invention relates to a method of manufacturing packaging bags having lateral bellows, the method being characterized by the fact that it comprises the steps consisting in: forming respective cutouts (150, 160) in each of the two lateral, bellows-forming zones of a packaging bag sheet (100) so that the bag has only two thicknesses superposed at the mouth of said bellows, at least over a portion of its width; and heat-sealing (184, 186) the adjacent edges of the sheet to the peripheries of the cutouts (150, 160) to close the bag. The invention also provides apparatus for implementing the method and bags obtained thereby.