Abstract: A sheet processing apparatus includes a rotating member, a switching unit, and a pressing unit. The rotating member is rotatable and has a facing portion that faces a fold section of a sheet. The rotating member rotates so as to switch the facing portion to another facing portion. Each facing portion is provided with a protrusion. A set position of the protrusion in an axial direction varies from facing portion to facing portion. The switching unit rotates the rotating member so as to switch the facing portion that faces the fold section. The pressing unit presses the protrusion of the facing portion against the fold section.

Abstract: An adjustment mechanism for an anvil roll has a body with first and second ends and a hollow interior. A bore extends from the first end into the hollow interior. The body is mountable to an axial end of the anvil roll at the first end. The hollow interior has first and second adjustment drives. The first adjustment drive extends from the second end of the body into the hollow interior and comprises a gear train with drive gears extending between a first adjustment operator and a first shaft extending from the body hollow interior through the bore of the body to the first end of the body. The second adjustment drive comprises a gear train with drive gears extending between a second adjustment operator and a second shaft extending from the hollow interior through the bore of the body to the first end of the body.

Abstract: According to one aspect, a vehicle control system. The control system includes a steering control coupled to at least one steerable wheel, the steering control having a first position, a second position and a plurality of positions therebetween. The control system also includes a steering sensor coupled to the steering control and configured to generate steering sensor signals based upon the position of the steering control. The control system also includes a control module coupled to the steering sensor, the control module configured to (i) record a first steering sensor signal value when the steering control is in the first position; (ii) record a second steering sensor signal value when the steering control is in the second position; and (iii) determine a current position of the steering control by comparing the first and second steering sensor signal values with a current steering sensor signal value.

Abstract: A method for producing an elasticated chassis web for use as a continuous and coherent layer in a disposable garment, including attaching continuous elastic elements (10,11) to a continuous base web (1) along regularly undulating wave-shaped curves (12,13) and cutting out pieces (21) in crotch segments (4) of the continuous base web (1) in order to remove selected parts of the elastic elements (10,11) from the base web (1). A disposable garment made from the elasticated chassis web includes a chassis layer (56) having a hole (69) in a garment crotch portion (43).

Abstract: For manufacturing books having different sizes and comprising a plurality of text pages constituting a book block, a web of material having a given width is sequentially printed in a digital printing station. The printed web of material is then provided either with one weakening line extending parallel to the longitudinal direction of the web of material or with two weakening lines arranged spaced apart and extending parallel to the longitudinal direction of the web of material. Thereafter the printed web of material is transversely cut to produce individual text sheets which are provided with either one weakening line or two weakening lines. These text sheets are then longitudinally folded along the either one weakening line or in sequence along each of the two weakening lines. The folded text sheets belonging to a particular book block are stacked to a stack. The stacks are either temporarily stored for a later binding process or directly supplied to a binding station.

Abstract: The present invention provides a method of providing a disposable product with zero waste ear formation and attaching the ears to a running chassis web.

Abstract: A post-press apparatus which advances paper once to accomplish processing of cotton boxes, includes a sheet feeder unit, a hot foil stamping unit, a die-cutting unit, a waste stripping unit, a blank separation unit, a waste conveying unit, a gripper bar and a gripper bar chain. The advantages are that works to be done by multiple apparatuses are accomplished on one apparatus, reducing a number of times of paper advancing to improve a production efficiency and decreasing staffs to reduce a labor cost; inaccuracy of repetitive positioning by multiple times of paper advancing is avoided, improving a processing quality and reducing a defect rate to decrease a loss.

Abstract: A method and apparatus for performing an order change in a corrugator uses a minimum slit head configuration with all slit heads carried on two sides of a single tool support structure. A single robot is operable on the support structure to independently reset the positions of slit heads during a running order to prepare for subsequent order change in a most efficient manner, utilizing order scheduling that eliminates order changes that cannot be formed with the minimum slit head configuration.

Abstract: A stitch flap cutting block is mountable to a cutting head of a board blank cutting machine, along with a slotting knife. A sheet of board passed between the cutting head and an anvil head is cut to form a blank for a box or the like. The cutting block comprises a steel body with a cylindrical barrel holding a cylindrical spring block, to which is mounted a blade holder carrying an elongate blade. The blade moves within a transverse slot across the body and is deflectable into the body and may rock about a midpoint of the slot. Impact forces are reduced, cleaner cuts are produced, and re-setting of the blade is required much less often. An alternative stitch flap cutting block is mountable to the cutting head by a separate side arm, facilitating mounting to cutting heads having different diameters.

Abstract: A post-press apparatus which advances paper once to accomplish processing of cotton boxes, includes a sheet feeder unit, a hot foil stamping unit, a die-cutting unit, a waste stripping unit, a blank separation unit, a waste conveying unit, a gripper bar and a gripper bar chain. The advantages are that works to be done by multiple apparatuses are accomplished on one apparatus, reducing a number of times of paper advancing to improve a production efficiency and decreasing staffs to reduce a labor cost; inaccuracy of repetitive positioning by multiple times of paper advancing is avoided, improving a processing quality and reducing a defect rate to decrease a loss.

Abstract: An improved tabbed divider making apparatus is disclosed. The machine preferably improves upon existing tabbed divider making machines in its ease of use and efficiency. Among other elements, the machine may include a paper feeder, a processing section, and an output tray. An improved film delivery system is also disclosed, as well as methods relating to manufacturing of tabbed dividers.

Abstract: A presser assembly is provided in which a presser plate or presser board mounting adapter is clamped to a lower end of a presser stem. A rail having a lower channel and an upper channel is provided for clamping the presser plate or presser board mounting adapter to the stem, and more particularly, a presser foot coupled to the lower end of the stem. The present invention allows the presser plate or the presser board mounting adapter to be mounted to the stem without the use of tools or fasteners.

Abstract: A cutter includes a male blade, a female blade, an advancement and retraction controller and a suction device. The male blade includes: a linear cutting portion linearly shaped with a predetermined thickness in a center part; a rounded cutting portion where a radius having a substantially arc shape in planar view is continuously formed from the linear cutting portion; and an end provided adjacent to the rounded cutting portion. The female blade has a fitting portion that is a hole conforming to the profile of the male blade in planar view and to which the male blade is fitted. On a lateral side of the female blade, an elongated hole for inserting a base film from one lateral side to the other lateral side is formed as an insertion portion.

Abstract: This invention relates to a method for the production of blanks made of cardboard or of cardboard-like material and a device suitable for it. An integrated plotter module by which the individual workpieces are positioned in the longitudinal direction by the transfer drive is an important feature.

Abstract: Stacks of pieces (24) are cut out from the lay-up (20) on a cutting table, on the basis of recorded information relating to the locations of the pieces on the surface of the lay-up, and the skeleton (26) of the lay-up is split up (lines 28) into a plurality of portions while the stacks of pieces are being cut out. Then the lay-up is brought onto an unloading table (60) for successively unloading the stacks of cut-out pieces by causing an unloading tool (80) to move so as to bring it into contact with the stacks that have arrived on the unloading table, by using information relating to the locations of the pieces, and so as to take off each stack from the remainder of the lay-up merely by moving it substantially parallel to the plane of the lay-up, without interfering with the stacks of pieces that have not yet been unloaded.

Abstract: This invention forms a loose fill packing material comprising clean, elongated strips of paper formed from corrugated cardboard having internal fluting formatted to expand in height, improving the ability of the strips to lattice. A vertical slitter divides cardboard into blanks of a predetermined width generally with the grain of corrugation. The blanks are fed into a shredding device that cuts the blanks with a scissor motion across the width of the blank. The strips pass onto a cleated perforated conveyor and into an enclosed suction housing. Inside the suction housing is a vortex box enhancing air flow for cleaning the strips. Strips are centered on the conveyor. The strips move from the conveyor to an angled, vibrating sifter plate into a collector. Strips are sprayed with a liquid material having microbicidal, sanitizing, insect repellant, disinfectant and/or deodorizing properties.

Abstract: A dunnage removal apparatus is situated adjacent a load conveyor and more particularly at a transfer device that moves a unitized load from the load conveyor to a pre-feeder. The dunnage removal apparatus includes a guide chute that funnels a loose flap of the dunnage sheet toward a sheet stripper mechanism. The mechanism includes a motor driven drive roller and a pair of pinch rollers that pinch the flap and pull the dunnage sheet from beneath the load. The pinch rollers are supported for movement relative to the drive roller to accept dunnage sheet(s) of variable thicknesses. A backstop plate is provided that moves with the pinch rollers. The load bears against the backstop plate as the dunnage sheet(s) is removed.

Abstract: A polymeric film having a plurality of perforations, which are specially structured and arranged is described. The polymeric film provides a strong, high-tensile strength material that permits hand tearing of the film along a desired tear path, providing a controlled tear propagation line. The polymeric film may also be incorporated into a multi-layer film having cloth-like properties of strength and tear propagation, and is suitable for use various adhesive tape applications. Methods of making the polymeric film are also disclosed.

Abstract: An apparatus is arranged to successively make plastic bags each of which has a shape of circumference. The apparatus comprises web feeding means by which a web material is intermittently fed for a length along a longitudinal feeding path. The web material comprises two or more layers of plastic film. Web cutting means is disposed along the feeding path. The web cutting means has a shape corresponding completely or incompletely to the shape of circumference of plastic bag so that the web material can be cut into the shape of circumference of plastic bag by the web cutting means whenever the web material is intermittently fed and temporarily stopped, to successively make the plastic bags with a waste kept continuous. The web cutting means comprises partially cutting means. The plastic bag has an upstream edge along which the web material is partially cut by the partially cutting means so that the plastic bag can be kept connected with the waste at the upstream edge of plastic bag.

Abstract: Leading and trailing edge stitch tab scrap strippers utilize pivot arms which are secured to die block bodies for pivotable motion intermediate their two ends. One end of each arm is adapted to engage a stitch tab scrap portion to be stripped and to effect the removal of the tab scrap from a box blank from which it has been cut. A biasing force is applied against a second end of the pivot arm. The pivot arm is caused to pivot in response to the rotation of an upper male slotting head and a lower die cutting anvil. This pivotal movement is effective to strip or to eject the severed stitch tab scrap.

Abstract: A device used to separate and discard a skeleton formed when a blank is cut into the pattern of a folding carton, envelope, or other desired shape is provided. The device includes first and second separating cylinders. The second separating cylinder includes at least one protrusion extending from the surface thereof, and also has at least one recess formed therein. The protrusions are used to couple the skeleton to the second cylinder. The device further includes a stripping plate having a leading edge positioned near the second cylinder. At least one stripping finger extends from the edge of the stripping plate and within the recess of the second cylinder. The stripping finger is thereby positioned between the second cylinder and the skeleton as the second cylinder rotates toward the stripping finger. The stripping finger operates to disengage the skeleton from the protrusions, thereby stripping the skeleton from the second cylinder.

Abstract: The present invention generally encompasses a device for removing waste material from a blank. The invention includes a rotatable stripping pin housing and a stationary cam. The stripping pin housing includes a number of radially extending grooves in its axial surface. Each groove terminates at an aperture located in the stripping pin housing's circumferential surface. A stripping pin apparatus having an radially outwardly extending stripping pin capable of penetrating waste material and an axially extending cam follower is position within each groove. Each cam follower is engaged within a cam track in the stationary cam. The stripping pin housing is placed so that the stripping pins will engage waste material (and not the blank) as the material passes the device. Thereafter, the stripping pin housing is rotated causing the cam followers to travel along the cam track so that the radial location of the cam track determining the radial position of the stripping pins.

Abstract: This universal ejection tool (1) for the waste from a blanking press for cutting out sheet elements, particularly for a press for cutting sheet elements such as paper or cardboard intended for the production of packages, comprises a frame (2), the top part of which is equipped with a plate (10) perforated with a plurality of holes (11) uniformly distributed. The bottom part of said frame is provided with a plate (12) identical to the plate (10) and of substantially identical dimensions to those of the frame (2). Said plate (12) is also perforated with a plurality of holes (13), which are perfectly aligned with the holes (11) in pairs on vertical straight lines. Said plates (10, 12) are separated in the inner space of the frame (2) by a separating means. The vertical pairs of holes (11, 13) are traversable by ejection needles (30), which are simply held therein by a spring effect.

Abstract: A method and device for trimming flaps formed upon joining a leading end of a new roll to the trading end of a web of a preceding roll in which the web, after joining, is guided around an upstream roller, along a straight path and then onto a downstream roller. A nozzle directs an air stream in the direction of movement of the web or along the width thereof to cause the flap to erect. Downstream of the nozzle a blade trims the flap while it is erected by the air stream.

Abstract: In an apparatus for making plastic bags from a web material comprising two or more layers of plastic film, the material is intermittently fed for a length along a longitudinal feeding path, to successively make plastic bags with wastes, each of the wastes having upstream and downstream edges. The apparatus includes partially cutting means disposed at a first station predetermined along the feeding path. The material is partially cut by the partially cutting means along the upstream and downstream edges of waste whenever intermittently fed and temporarily stopped. The apparatus further includes waste removing means disposed at a second station predetermined downstream of and at a distance from the first station. The waste reaches the second station when the material is intermittently fed again after partially cut by the partially cutting means. In addition, the apparatus includes discharge means disposed at a third station predetermined downstream of and at a distance from the second station.

Abstract: A method and apparatus for mounting an ejector to a die board including an ejector retaining recess in the die board and a portion of the ejector retained in such base without glue.

Abstract: An extraction apparatus for extracting or separating cut or partially cut pieces or parts from a cut sheet at an extraction station comprises: a sheet gripping and moving device for gripping and moving a cut or partially cut sheet through an extraction station; and an extraction roller at the extraction station positioned for movement transversely of a cut sheet and being constructed, arranged and operated to move transversely of the path of movement of the cut sheet when the leading edge scrap web of the cut sheet is adjacent the extraction roller to engage and deflect the scrap web of the cut sheet passing through the gripping and moving device away from the cut pieces or parts.

Abstract: A method of forming a plurality of easy to open handle bags is provided. The method includes providing a flattened tube of thermoplastic material oriented in a generally longitudinal direction. The flattened tube has a first longitudinal side edge, a second longitudinal side edge, and a transverse heat seal. The tube has first, second, and third sections. The second section is disposed between the first and third sections. The first section is joined to the second section along a generally longitudinal first fold line. The second section is joined to the third section along a generally longitudinal second fold line. A generally rectangular hole is cut through the second section. The generally rectangular hole has a top edge and a bottom edge. The generally rectangular hole is contained transversely between the first and second fold lines.

Abstract: A method of forming a plurality of easy to open handle bags including the steps of providing a flattened tube of thermoplastic material oriented in a generally longitudinal direction. The flattened tube has a first longitudinal side edge and a second longitudinal side edge, a transverse lower heat seal, and a transverse upper heat seal. The tube also has first, second, and third sections. The second section being disposed between the first and third sections. The first section is joined to the second section along a generally longitudinal first fold line. The second section is joined to the third section along a generally longitudinal second fold line. The second section is cut along a generally transverse first cut line extending between the first and second fold lines. The first section is folded over the second section along the first fold line.

Abstract: An apparatus, method, and pack of tabless, self-opening bags with flapless aperture cutouts pack. In the apparatus and method, cylindrical dies connected to a vacuum source are used to cut out plugs of holes, and the plugs are evacuated to a receptacle. Compression bars, or a relatively shallow bevel cut on the cylindrical die, are used to form area of frangible bonding in the central tab portion of the bag pack. The pack of tabless, self-opening bags with flapless aperture cutouts has no flap portions which might inadvertently detach from bag pack.

Abstract: An elongated rubber ejector is mounted to a die board that forms a part of a cutting die and the ejector functions to engage cut corrugated board and eject the same from the cutting die. The rubber ejector includes upper and lower faces or surfaces with each face including a series of spaced apart raised lugs with a series of spaced apart voids or relief areas disposed between the lugs. Lugs and relief areas formed on one face are staggered with respect to the lugs and relief areas formed on the other face. In practice, the lugs are compressed during a die cutting operation. Once the corrugated board has been cut and the die board and an opposed anvil have been moved apart, the lugs and the ejector expand and in the process the rubber ejector engages the cut corrugated board and ejects the same from the cutting die.

Abstract: An apparatus for the manufacture of sheets of corrugated board of variable size comprises a cross cutter for severing the entire web of corrugated board disposed, in the conveying direction of a web of corrugated board, downstream of at least one longitudinal cutting arrangement, of cutting devices for cutting lateral margins and of discharge devices for the margins cut off, and upstream of at least one cross cutting arrangement for cutting sheets of corrugated board.

Abstract: The automatic trimming machine of the present invention utilizes a conventional web press to print various sizes of postal and insert cards, flyers and coupon books completely on-line. The automatic trimming machine of the present invention includes a device (12) for perforating the paper to define a folding line (14) and a paper folding device (16) for folding the paper along the perforated folding line. A preliminary trimming unit will first trim the left and right sides of the folded paper, including removing the backbone of the folded paper. The severed backone is then removed from the preliminary trimming unit. The top and bottom edges of the paper are then trimmed to the appropriate size prior to the paper being cut into distinct products in a finish trimming unit. The finish trimming unit includes a plurality of adjustable cutting blades to allow for cutting of various sized products.

Abstract: A device for removing blanks which have been cut into a sheet of paper or cardboard and are separated from each other by intermediate strips and are surrounded by a crosswise frontal and a crosswise back strip and two lengthwise side strips. The device includes a lower tool having a grid having apertures corresponding to the size and shape of each of the blanks with bars for supporting the intermediate strips, the lengthwise side strips and front and back crosswise strips, and an upper tool having pushing elements of a shape similar to the blank for pushing the blanks through the apertures of the lower tool and also having pressing devices for holding the intermediate and side strips against the respective bars of the lower tool during the step of separating.

Abstract: A method of producing doilies includes coating sheets of paper stock with a lubricious release fluid, collecting the sheets into a multi-layered web, and cutting and embossing doilies from the web. The fluid is preferably a solution of mineral oil and silicone, and results in the doilies being more easily separable after being adhered by the cutting and embossing process. A solution of mineral oil and 15%-40% silicone is disclosed.

Abstract: A paper product, such as an advertising brochure, a cover or the like, is formed by using the novel method of the present invention. In the present method, a continuous moving web of paper is provided. The web is longitudinally slit at positions offset to one side of a longitudinal axis of the web, preferably a centerline axis, at spaced positions to form a plurality of longitudinal slits which are separated from each other by a continuous portion of the web. Thereafter, adhesive is deposited on the web at a position offset from the longitudinal slit, and preferably along a side margin of the web. A first portion of the web is folded over onto a second portion of the web along a fold line at a position between the longitudinal slit and the adhesive. Next, the first portion is secured to the second portion by the adhesive to form a secured section. The longitudinal slit is thereafter positioned between the secured section and the fold line.

Abstract: A presser assembly (10) is provided for supporting carton blanking scrap during a blanking operation. The presser assembly (10) includes a presser rail (114) having a first end (116) mounted to a guide cylinder (32) and a second end (154) mounted to a second guide cylinder (32) such that each end of the presser rail is vertically movable independent of the opposite end. This, in turn, prevents jamming of the presser assembly during the blanking operation.

Abstract: A rotary pin stripper is disclosed for separating scrap pieces of paperboard from finish pieces after the pieces have been cut in a die cutter. In the preferred embodiment, the pin stripper cylinder is supported at mid-length, and the stripper cylinder is readily released for replacement and/or repair, while also providing for torque transmission between two separate, axially extending sections of the eccentric cylinder.

Abstract: A method for providing paperboard to paperboard facing surfaces for forming an effective seal for cartons formed from a laminate of a relatively flexible fluid impervious material and a relatively rigid paperboard material.

Abstract: A flat insulated container blank for forming the sidewall of a conventional insulated paper container made on a rotary turret single wrap cup making machine includes an inner layer of container stock, an intermediate layer of insulating material adhered to the container stock and an outer layer of label material. The blank is made from advancing webs of sheet material by a continuous form process.

Abstract: A resilient-scrap ejector is provided for a cutting die. The scrap ejector includes an elongated body made of a resilient material. The elongated body includes a longitudinally-extending web. A plurality of lugs extend from opposite sides of the web and are separated by notches. The notches provide void spaces which allow for deformation for the elongated body when the elongated body is subjected to compressive forces. The scrap ejector is located in a cavity or recess formed in the cutting die for ejecting and stripping scrap severed from the blank. By providing displacement zones or voids, the height of the scrap ejector can be increased without compressing the material beyond the limits of its resiliency.

Abstract: The invention provides an apparatus (26) for forming a box blank from a generally-rectangular sheet of material. The apparatus has a frame (28) for supporting and guiding the sheet; and endless advancement belt (31) for controllably moving the sheet relative to the frame through the apparatus; guide rails (32) extending generally across the sheet; a carriage (34) mounted on the guide rails for horizontal movement relative thereto; a cutting blade (35) mounted for horizontal movement with the carriage and operatively arranged to be rotated about an axis; a blade actuator (36) for selectively causing the blade to have a vertical component of movement relative to the carriage; a punch (38) mounted on the carriage and selectively operable to punch a hole in the sheet; a transverse creasing roller (39) mounted on the carriage; and a pair of adjustable longitudinal creasing rollers (40) mounted on the platform.

Abstract: A paper pallet (D, D1) formed by cutting and combining a plurality of cardboard panels (3). A cutting device (A), extruding mechanism (B), and an adhesive application mechanism (C) are generally provided to sequentially cut and adhesively accumulate layers of cardboard extrusion members (3a, 3d) into a multi-layered cardboard assembly characterized in that the stress applied the pallet (D, D1) formed therefrom is parallel to the corrugations of the cardboard panels (3) employed. A high-strength paper pallet is thus realized.

Abstract: A waste stripping station for a machine for die-cutting plate-like workpieces includes a perforated board which is positioned between an upper movable tool and a lower movable tool for supporting a plate-like workpiece carried into the station by grippers. Waste bits of the workpiece are pinched between pins or elements of the upper and lower stripping tools and are carried vertically downward through perforations in the board. In order to provide clearance for the grippers, the perforated board is mounted to pivot around an upstream edge in order that its downstream edge may be lifted from a position allowing passage of the grippers to a position slightly lifting the plate-like workpiece.

Abstract: A presser assembly is provided for supporting carton blanking scrap during a blanking operation. The presser assembly includes a presser rail having a first end mounted to a guide cylinder and a second end mounted to a second guide cylinder such that each end of the presser rail is vertically movable independent of the opposite end. This, in turn, prevents jamming of the presser assembly during the blanking operation.

Abstract: An apparatus for forming loose fill packing material which comprises a shredder device operative to convert sheets of corrugated cardboard into elongated, thin paper strips which are discharged onto a perforated conveyor movable between a loading position at the shredder device and a discharge position where the strips are emptied into a collection hopper. A suction device is mounted beneath the conveyor, downstream from the shredder device, which is operative to apply a suction to the cardboard strips to remove dirt, dust and other foreign materials therefrom, and then the cleaned paper strips are transmitted along an angled sifter plate having a plurality of openings which are sized to allow undesired, short strips of paper to pass therethrough for deposit into a waste hopper. A spraying device is located at the sifter plate to deposit a liquid material on the paper strips having microbicidal, sanitizing, insect repellant, disinfectant and deodorizing properties.

Abstract: A presser assembly is provided for supporting carton blanking scrap during a blanking operation. The presser assembly includes a presser rail having a first end mounted to a guide cylinder and a second end mounted to a second guide cylinder such that each end of the presser rail is vertically movable independent of the opposite end. This, in turn, prevents jamming of the presser assembly during the blanking operation.

Abstract: The invention relates to a method of manufacturing shell-shaped packages, in particular flower sleeves, in which two superposed bands of synthetic material are supplied and machined through die cutting, in such a manner that at least one edge of each package, defining the wide opening, is formed along an ornamental line, whereafter the material bands are cut in transverse direction into separate package portions, the discrete package portions being joined together at the cut edges so as to form the package, wherein, during the die cutting of the longitudinal edges of the material bands, both material bands are perforated through and through in one die cutting operation so as to form suspension portions joined to the package portions via perforated lines extending along an ornamental contour, the suspension portion, formed by the perforation, of one of the two material bands being removed. The invention further relates to an apparatus for carrying out the method, and to the package obtained by the method.

Abstract: An improved method for forming tray, boat, tray, boat, and/or clamshell type, paperboard, cartons that have horizontal main wall panels and side wall panels, with corner flaps, joined to the main wall panels and extending therefrom and adhesively secured to each other. The cartons are formed from rolls or sheets of paperboard wherein the cutting, stripping, gluing, and forming operations are performed in a completely inline operation.

Abstract: A device for the pre-sealing of a document to a plastic band comprises at least one first cylinder on which the document is wound from a first given point of space tangential to the cylinder and a mechanism for heating the plastic band at a second point tangential to the cylinder where the plastic band is in contact with the document, this tangential point forming a constant angle (.alpha.) with the given point of space, the document being pre-sealed by the affixing of the plastic band to this second tangential point. Application to the pre-sealing, to a plastic band, of documents that are to be plastified on an industrial scale.