Abstract: A corrugator single facer of the type utilizing a large diameter bonding and corrugating roll and a small diameter corrugating roll is driven without direct drive applied to either corrugating roll. Instead, the pressure belt arrangement which supports the lower corrugating roll to provide the nipping force includes a series of driven supporting pressure belts that are loaded against the lower corrugating roll and which transmit rotational movement thereto and through the nip to the large diameter bonding roll.

Abstract: A corrugating machine for the manufacture of sheets of corrugated board comprises a first manufacturing unit for the production of a first web of corrugated board, a second manufacturing unit for the production of a second web of corrugated board, a mounting unit, which is disposed downstream of the manufacturing units in a working direction, for non-adhesively bringing together the first web of corrugated board and the second web of corrugated board and a working unit, which is disposed downstream of the mounting unit, for jointly working the first web of corrugated board and the at least second web of corrugated board that lie on top of each other.

Abstract: A corrugator unit, particularly for sheets or webs of paper, or similar, of the type comprising at least two rolls (1, 2), having a toothed or corrugated surface (101, 202), and being mutually engaged and pushed against each other by a predetermined pressure or force. The invention provides that the mutual compression between rolls (1, 2) is exerted (4, 5, 106, 21, 22, 25, 26) over the whole axial length of the rolls (1, 2). This may be obtained through mechanical (6) or magnetic (21, 22, 23, 25, 26) means.

Abstract: The invention relates to a method for joining a number of sections (7) of a thermoplastic continuous web material in order to form an expandable section block (2). Said block is built up by repeatedly carrying out sequences of steps of the method. The invention also relates to a device for forming said blocks at high speeds.

Abstract: A method and an apparatus for producing a thermoplastic filter material laid in folds, with the folds fixed in close vicinity. The thermoplastic filter material which has been heated for forming the folds is accumulated within a cooling path such that the folds are pushed together and fixed by cooling with respect to their shape.

Abstract: A fabric for use in an architectural covering device includes a plurality of elongated vanes preferably of tubular configuration having a pair of flaps extending longitudinally along the entire length of the vane. A continuous face sheet material has elongated folds at spaced intervals that are secured along the flaps of the vanes so as to pivotally connect the vanes to the face sheet material at predetermined spaced intervals. The fabric is adapted to be supported with an operational system in an architectural opening so that if the vanes are suspended vertically they are slidably movable laterally of the window opening and pivotally movable about vertical longitudinal axes to extend and retract as well as open and close the covering. An apparatus and method for forming the fabric is also disclosed as well as systems for finishing the endmost vanes in the fabric.

Abstract: The present invention relates to a method capable of certainly correcting a phase shift between a plurality of core paper layers. In the method according to this invention, the next phase shift quantity &dgr;′3 is estimated on the basis of a previous measured phase shift value &dgr;1 and the present measured phase shift value &dgr;2 and a single-faced corrugated fiberboard sheet tension changing quantity &Dgr;T1 for correction of the next phase shift quantity &dgr;′3 estimated is calculated to adjust the tension to the single-faced corrugated fiberboard sheet on the basis of the calculated tension changing quantity &Dgr;T1. This invention is effectively applicable when, for example, manufacturing a two-layer core single-faced corrugated fiberboard sheet or the like.

Abstract: The invention relates to a preheating device for locally controllable preheating of a material web (12) comprising at least one smooth web and/or at least one corrugated web and moving in feed direction (A), before any adhesive is applied to the material web (12) and before the web (12) is glued to at least one other material web to form a corrugated cardboard web. The device comprises a preheating element (14) adapted to be fed with heat transfer fluid and which is in contact with the material web (12) at a contact surface (17) extending across the entire width (b) of the material web (12). The preheating element (14) comprises a plurality of adjacent preheating sections (50, 50′, 50″, 50′″) arrayed across the width of the material web (12) and each extending the length of the contact surface (17), each of which sections can be separately fed with heat transfer fluid, preferably steam.

Abstract: A corrugator belt for a corrugator machine includes a base having two sides. One of the two sides is the face side of the corrugator belt when the belt is in the form of an endless loop on a corrugator machine. A layer of polymeric resin material is coated onto the face side of the base. The polymeric resin material provides the corrugator belt with an increased coefficient of friction relative to corrugated board, enabling the belt to pull corrugated board more readily through a corrugator machine.

Abstract: The invention relates to a pressure plate arrangement for joining together a plurality of material webs each comprising at least one plain web and/or at least one corrugated web, to form a corrugated cardboard web (P), at least one of the material webs being provided with adhesive at least in sections. The arrangement comprises a contact pressure unit (14) provided with a pressure plate (22), and a heatable counterpressure plate (26), between which the material webs being joined together are passed. The contact pressure unit (14) and the pressure plate (22) are arranged to be approachable to or removable from the counterpressure plate (26), wherein the pressure plate (22) is also constructed to be heatable. The invention also relates to apparatus for joining together a plurality of material webs comprising a plurality of such pressure plate arrangements.

Abstract: An apparatus and related method for forming a single face paperboard web are disclosed. The apparatus of the present invention includes a forming corrugating roll for corrugating flutes on a medium web and a carrier corrugating roll operably connected to the forming corrugating roll for carrying the medium web into contact with a liner web. A bonding nip is defined by the carrier corrugating roll for pressing the liner web into adhering contact with the medium web, thereby forming a single faced web. A steam supplying device, including at least one fluid port in fluid communication with the bonding nip, supplies a low pressure steam against at least one of the liner web and the medium web. The steam supplying device further includes a body having a heated surface facing one of the liner and the medium webs. A primary channel extends within the body and is in thermal communication with the heated surface. A high pressure steam is supplied to the primary channel for heating the heated surface.

Abstract: A moving-web slack reducing system including a deformable tension roller, such as a brush-type tension roller having an outer surface defined by the ends of a plurality of bristles. The slack reducing system may be deployed in a preheater assembly for a machine for manufacturing corrugated board. The bristles of the deformable tension roller allow the outer surface of the tension roller to deflect both radially and in the cross-machine direction without binding to the paper web. The bristles may also deflect variably across the tension roller in the cross-machine direction. Thus, the deflection of the bristles adjusts automatically and virtually instantaneously to changes in the tension of the paper web to compensate for variations in tension across the web in the cross-machine direction. This allows the brush-type tension roller to take the slack out of the paper web without having to rapidly and precisely adjust any actuators.

Abstract: An impermeable corrugator belt for a corrugator machine includes a multi-layer base fabric having a layer of a polymeric resin material on one of its two sides. When arranged in the form of an endless loop, the side having the layer of polymeric resin material is on the inside thereof. The polymeric resin material renders the corrugator belt impermeable, and therefore suitable for use on a corrugator machine having air-bearing pressure zones. Instead of a multi-layer base fabric, a spiral coil carrier may be used as the base of the corrugator belt.

Abstract: A fabric for use in an architectural covering device includes a plurality of elongated vanes preferably of tubular configuration having a pair of flaps extending longitudinally along the entire length of the vane. A continuous face sheet material has elongated folds at spaced intervals that are secured along the flaps of the vanes so as to pivotally connect the vanes to the face sheet material at predetermined spaced intervals. The fabric is adapted to be supported with an operational system in an architectural opening so that if the vanes are suspended vertically they are slidably movable laterally of the window opening and pivotally movable about vertical longitudinal axes to extend and retract as well as open and close the covering. An apparatus and method for forming the fabric is also disclosed as well as systems for finishing the endmost vanes in the fabric.

Abstract: A unit for joining paper sheets together in corrugated board manufacturing equipment comprises at least one toothed or corrugated roll (1), which is mounted in such a way as to rotate about its axis; means (5, 6) for feeding and pressing at least one flat paper sheet (C2), which interact with the toothed or corrugated roll (1) in laying said flat sheet (C2) over the corrugated paper sheet (C0) conveyed by said toothed or corrugated roll (1) and gluing means (4) which apply adhesive on one of the sheets. According to the invention, the means for feeding/pressing the flat paper sheet (C2) against the corrugated paper sheet (C0) on the toothed or corrugated roll (1) consists of a roll (6) which is mounted in such a way as to rotate about its axis and parallel to the toothed or corrugated roll (1) and which is made, at least at its periphery (106) of a layer of natural or synthetic fibers or compacted blends thereof, having a certain compressibility and/or deformability.

Abstract: A heating device (1) for a corrugated cardboard facility includes several heating plates (3) arranged sequentially along a path in the advancing direction of a sheet of corrugated cardboard (2). Compression elements (4) are arranged above the heating plates (3) in position to act on the sheet of corrugated cardboard (2) as it advances along the path. An intake belt (e) is located in a starting area (a) of the heating plates (3) between at least a part of the sheet of corrugated cardboard (2) and at least one compression element (4.1, 4.2).

Abstract: The invention relates to a process for manufacturing corrugated board in which the corrugated board is produced by gluing at least three individual constituent webs (3, 5, 7) respectively on two sides oriented toward each other, wherein in a single work cycle, at a first glue application point (A), a first constituent web (3) is coated with glue and at a second assembly point (B), the first constituent web (3) is glued to a second constituent web (5) to form a half-finished web (31), and wherein in the same work cycle, at a second glue application point (D), glue is applied to a third constituent web (7) or to the half-finished web (31) and the third constituent web (7) is glued to the half-finished web (31) at a second assembly point (C) that is removed in the web travel direction in relation to the first assembly point (B). Furthermore, the invention relates to a device for carrying out the process according to the invention.

Abstract: The present invention relates to a sheet tension adjusting method which allows the tension to a single-faced corrugated fiberboard sheet or a liner to be greatly adjusted with a high accuracy to be capable of the adjustment of upward or downward warps of the corrugated fiberboard sheet. In the method according to this invention, when manufacturing a single-faced corrugated fiberboard sheet S.sub.1 in a manner that a liner L.sub.1 is adhered onto a corrugated sheet C.sub.1, the single-faced corrugated fiberboard sheet S.sub.1 is wound around one or more rolls 1 to change a braking force to the roll 1, thereby adjusting the tension to the single-faced fiberboard sheet S.sub.1. Further, this invention is effectively applicable in manufacturing various kinds of corrugated fiberboard sheets.

Abstract: A device for production of corrugated cardboard, comprising a first fluted roller (1) and a second fluted roller (2) together forming a corrugating gap (3), a pressure contact roller (4) forming a pressure contact gap (5) together with the second fluted roller (2), feeding means (18) to feed a corrugating strip (16) to the corrugating gap (3) in which the corrugating strip (16) is deformed to make the corrugated strip (20), feeding means (26, 28) to feed a smooth strip (24) to the pressure contact gap (5) in which the smooth strip (24) is pressed into contact with the corrugated strip (20) with an intermediate glue layer to produce a composite strip, and advancing means (36, 38, 40) to advance the composite strip (34) formed by bonding the corrugated strip (20) to the smooth strip (24). Each of the two fluted rollers (1, 2) has a fluted profile on its periphery with profile peaks (PS1, PS2) and profile valleys (PT1, PT2) cooperating in the corrugating process.

Abstract: An apparatus and related method for forming a double face paperboard web are disclosed. The apparatus of the present invention includes a heating section upstream from a drawing section. The heating section includes at least one heating plate having an upper surface facing a paperboard web and heated by a plurality of primary channels supplied with steam. A plurality of secondary channels extend through the heating plate intermediate the primary channels and a lower surface of the plate. A plurality of outlet ports communicate with each secondary channel and the upper surface of the heating plate. Steam supplied to the secondary channels exits through the outlet ports thereby producing a steam film between the upper surface of the heating plate and the lower surface of the paperboard web. The steam film substantially reduces frictional forces opposing movement of the web while also dramatically increasing the heat transfer to the paperboard web and accelerating the gelatinization of the glue therein.

Abstract: A paperboard corrugating machine for forming board having two corrugated mediums joined at their flute tips without any intervening liner. The machine comprises a relatively heavy main frame (11) and a second frame (12) which is mounted for movement on the main frame. The main frame (11) carries two rolls (13 and 14) and the second frame (12) carries two rolls (15 and 16). Frame (12) can be locked into position and loaded against the upper roll (13), and the four rolls (13, 14, 15 and 16) lie in a single plane when the rolls are operational. With this construction, movement and twisting of the rolls (13 and 15) relative to each other, between which the fluted mediums are aligned flute tip to flute tip, is reduced.

Abstract: A machine for the production of a single-face lined web of corrugated board comprises a pressing device for pressing a liner web on a paper web provided with a corrugation. This pressing device comprises a vapor permeable pressing belt which consists of a fabric of metal with warp threads and weft threads. The warp threads arc provided in groups of three warp threads at a time, the distance of two neighboring groups of warp threads being smaller than the width of each group of warp threads. Preferably, the material of the weft threads is softer than the material of the warp threads, the weft threads having notches, in each of which a warp thread is disposed.

Abstract: A corrugator double backer includes a web holddown apparatus that provides both heat and a holddown force to the upper surface of the paperboard web to maintain the web in intimate drying contact with the lower heating units without the use of a conventional driven holddown belt. A heated holddown mat which is longitudinally and laterally flexible is provided by a series of generally parallel, somewhat flexible, closely spaced heating tubes which are suspended above the web in the heating section in catenary fashion in the direction of web travel. Lift devices on one or both ends of the mat of tubes can vary the amount of mat contact with the web and, therefore, the heat and load imposed on the web. The tubes are steam heated and have flat low friction, high wear resistant lower surfaces which lie directly atop the corrugated paperboard web running thereunder.

Abstract: A first tension adjustor for adjusting the tension of a liner and a pitch measuring device for measuring the corrugation pitch of a first core board of a single-faced corrugated board are used. A first tension controller operates so that the tension acting on the liner is adjusted on the basis of the corrugation pitch of the first core board of the single-faced corrugated board. Further, a second tension adjustor for adjusting the tension of the single-faced corrugated board and a phase shift measuring device for measuring a phase shift between the corrugations of the first core board of the single-faced corrugated board and the corrugations of a second core board to be laminated to the first core board are used. A second tension controller operates so that the tension acting on the single-faced corrugated board is adjusted on the basis of the phase shift measured by the phase shift measuring device.

Abstract: A single face splicer for creating a splice between a running web from a first source of single face material and a ready web from a second source of single face material to provide an uninterrupted supply of single face material to a double backer system in the manufacture of corrugated cardboard. The splicer includes an upper and lower bridge positioned above the first and second sources of single face material, and a splice head adjacent the upper bridge for creating the splice between the running web and the ready web. A drive system draws the running web through the splice head at an output speed which is greater than the speed at which the double backer system draws the running web from the splicer. The running web is deposited on an upper bridge supply belt which rotates at a speed which is slower than the output speed thereby causing the running web to accumulate on the upper bridge supply belt.

Abstract: This invention relates to improved apparatus for forming paper board structures in which two corrugated mediums are bonded together at their flute tips. The apparatus comprises: two register rolls for ensuring that the mediums are brought into precise flute tip to flute tip alignment for bonding; dependent electric motors to drive the register rolls in which one roll is driven by a reference motor and the second register roll is driven by a follower motor; location sensing devices associated with each register roll to measure a value related to the location of a position on the periphery of each register roll; control means which compares the measured values for each register roll and if necessary adjusts the voltage or current of the follower motor to maintain alignment of the flute tips of the two mediums.

Abstract: This invention relates to a double facer of a corrugating machine which aims to improve a drying state or bonding state between a single-faced corrugated fiberboard sheet and a liner and improve the quality of a corrugated fiberboard sheet. In a double facer for bonding together a single-faced corrugated fiberboard sheet and a liner to form a corrugated fiberboard sheet, provided are a heating member disposed along a conveying direction of the corrugated fiberboard sheet; a pressing unit, disposed so as to oppose the heating member, for pushing the corrugated fiberboard sheet against the heating member; a sheet conveying unit, disposed downstream the heating member, for conveying the corrugated fiberboard sheet; and a sheet feeding unit for feeding the corrugated fiberboard sheet toward the sheet conveying unit; while the pressing unit comprises a plurality of pressing devices disposed in series as being separated from each other along the conveying direction of the corrugated fiberboard sheet.

Abstract: The labyrinth path in the corrugating nip of a single facer is substantially reduced by utilizing a small diameter corrugating roll captured between a larger diameter conventional corrugating roll and a backing roll arrangement. The smaller diameter corrugating roll is captured to prevent bending thereof under corrugating loads. The corrugator may be operated at high speeds without the adverse increase in labyrinth path and web tension characteristic of a pair of large diameter corrugating rolls.

Abstract: A single facer including an auxiliary nip providing an adjustable auxiliary force acting upon a corrugated medium web and a liner web for effective bonding therebetween to form a single faced board is disclosed. An endless belt cooperates with a corrugating roll thereby defining a primary nip. The endless belt is guided over a plurality of belt rolls wherein one of the belt rolls defines an auxiliary nip for providing an auxiliary force pressing the endless belt and the liner web together with the flutes of the medium web. An adjustment means is provided for adjusting the auxiliary force within the auxiliary nip.

Abstract: An essentially non-contact holddown system for a corrugator double backer utilizes air pressure supplied by a plenum positioned above and closely spaced from the lower heating section which supports the corrugated web. Continuous edge sealing membranes seal the interface between the lateral edges of the plenum and the web, and overlie the edges of the web so that the seal is enhanced by the holddown pressure.

Abstract: An apparatus for lamination of a non-woven fibrous sheet and an extruded polymer sheet including a web slitter to divide the fibrous sheet into a plurality of webs, a plurality of folding means to fold each web, a plurality of separated turning bars to turn each folded web such that the webs are separated, and an extrusion laminator for laminating the polymer sheet to the separated webs to provide a laminate having a portion of the polymer sheet between the separated webs.

Abstract: In a process for manufacturing corrugated cardboard, corrugated cardboard is produced by gluing several individual webs (10, 11, 31) to each other by their mutually opposite surfaces. Several individual webs (10, 11, 31) are conveyed to an assembly point (A) and then moved over a heating device (38). The distance between the glue application points (B, C) and the assembly point (A) of the individual webs (10, 11) varies according to the speed of the webs.

Abstract: A presser shoe is disposed over the entire width of a single-faced corrugated board opposedly to a glue applicator roll with a traveling path of the single-faced corrugated board therebetween, and a flexible tube is provided which presses the presser shoe toward the single-faced corrugated board by air pressure. The air pressure to be fed to the flexible tube is regulated to a predetermined pressure by an air pressure regulator so as to afford a constant pressing force continually even in the use of single-faced corrugated boards of different flutes.

Abstract: The process for heating a moving web, in particular a corrugated board web, in addition to a supply of heat to the one outer side of the moving web, also provides supply of heat to the other outer side of the web (5). A preheater (1) with a first heating face (3), which is associated with a movable deflection roll, is connected to a second heating face (13) connected to the deflection roll (10). With its other outer side, the web (5) is guided via this second heating face.

Abstract: A machine and method for manufacturing corrugated board, including several machines for applying heat to both sides of the corrugated board during the manufacturing process. Different types of heat exchangers may be used on the top and bottom sides of the moving surface to transfer sufficient heat to the moving surface, to remove moisture and to cure the adhesive of the corrugated board. Independently controlled heat exchangers enable the manufacturer to regulate the heat applied to the corrugated board across the width of the machine and in the direction of the machine flow, in response to varying the desired width and thickness of corrugated board. Unused areas of the hotplate section may be isolated to minimize the heat loss in the machine when narrow width corrugated board is manufactured.

Abstract: In a stuck sheet material manufacturing system for manufacturing a stuck sheet material, which has a sticking device for sticking together a front sheet member and a rear sheet member, the sticking device includes a heating member for heating a sheet member and a pressure device provided oppositely to the heating member for pressing a stuck sheet material to the heating member, and the pressure device includes a supporting member arranged so as to be extended in a horizontal direction perpendicular to a traveling direction, a plurality of weight blocks suspended from the supporting member via elastic members and arranged side by side and vertical movement driving means for driving the vertical movement of the supporting member.

Abstract: An apparatus includes a take-up downstream from a heating surface for advancing corrugated paperboard sheet along a path of travel adjacent the heating surface; an initial sheet feeder for initially feeding a leading portion of the corrugated paperboard sheet along the path of travel; and sliding contact assemblies positioned opposite the heating surface for slidably contacting and applying pressure to urge the advancing corrugated paperboard sheet against the heating surface. Accordingly, heat is transferred from the heating surface to the moving corrugated paperboard sheet and without a conventional conveyor belt. The pressure applied by the sliding contact assemblies may be released when the initial sheet feeder is feeding the leading portion of the corrugated paperboard sheet. The apparatus may also generate a gas cushion to thereby reduce friction between the heating surface and the corrugated paperboard sheet when initially feeding the leading portion of the corrugated paperboard sheet.

Abstract: An apparatus for curing the web bonding adhesive and drying the corrugated paperboard web utilizes a top heating module contacting the upper face surface of the paperboard web for simultaneously heating the paperboard web along with a series of lower heating units. The top heating module includes of a series of internal heating elements. The heating elements are preferably tubes which receive a supply heated gas or liquid and transfer the heat contained therein to a heat exchange fluid within the module. The heat from the heat exchange fluid is then transferred to the paperboard web through a web-conforming contact member. As the paper-board passes through the double backer, the combination of the top heating module and the lower heating units cure the adhesive bonds in the paperboard web. The web-conforming contact member preferably comprises a thin metal membrane and the heat exchange fluid is a liquid.

Abstract: A double backer for curing the web bonding adhesive and drying the corrugated paperboard web utilizes a web holddown apparatus for maintaining the web in intimate drying contact with the lower heating units which does not require the use of a driven holddown belt. The holddown is provided instead by a series of parallel, flexible, closely spaced strips suspended above the web in the heating section and extending in the direction of web travel. Supplemental holddown force may be provided by banks of spring fingers supported above and in contact with the holddown strips on a transverse support rod which may be rotated to vary the amount of supplemental holddown force. Alternately, the holddown strips may comprise continuous cables in which one run of the cables rests upon the moving web to provide the web holddown and a second run includes high friction cable portions which are movable into driving contact with the upper surface of the web to pull it through the heating section, as for initial web thread up.

Abstract: An paperboard making apparatus includes at least one heating plate having opposing first and second surfaces; at least one electrically powered heater positioned adjacent the first surface of the heating plate; and a take-up for advancing a corrugated paperboard sheet along a path of travel adjacent the second surface of the heating plate so that heat is transferred to the advancing corrugated paperboard sheet. The electrically powered heater preferably includes a base, and an electrical heating element on the base. The base is preferably mounted so that the electrical heating element is positioned in closely spaced relation from the first surface of the heating plate so that the electrical heating element radiates heat to the heating plate. Accordingly, conventional steam heating chests are not used and their associated drawbacks are overcome. Method aspects of the invention are also disclosed.

Abstract: A heat transfer system in which a continuous web of material (13, 14) is carried past a hot plate surface (12) with one face of the web in contact therewith, and a series of fluid-filled vessels (15) above the web to apply a load on the upper surface thereof to maintain uniform contact between the web and the hot plate surface irrespective of any undulation thereof. A transport section to convey the web past the hot plate surface comprises upper and lower traction belts (16, 17) disposed entirely beyond the end of the hot plate surface (12) with a fixed plate (18) beneath the lower belt (17) and a series of fluid-filled vessels (19) above the upper belt (16) which serve to maintain adequate drive contact between the belts (16, 17) and the web (13, 14).

Abstract: A corrugated paperboard manufacturing apparatus includes preheaters, a double-facer, a cutter, and a board edge profile sensor downstream from the cutter for sensing a profile of a cut edge of a cut panel. A processor controls the double-facer and the preheaters responsive to the board edge profile sensor to thereby reduce warp in the cut panels. The board edge profile sensor is preferably an optical sensor, and, more preferably, may be a camera. Accordingly, near real time feedback may be used to adjust the upstream process to produce high quality paperboard. The board profile sensor also preferably further includes an associated scanner for optically or mechanically scanning the cut edge of the cut panel. A conveyor preferably carries the cut panels away from the cutter and toward a stacker. The board edge profile sensor may be positioned adjacent the conveyor or the stacker. Method aspects of the invention are also disclosed.

Abstract: A double backer for curing the web bonding adhesive and drying the corrugated paperboard web utilizes a web holddown apparatus for maintaining the web in intimate drying contact with the lower heating units which does not require the use of a driven holddown belt. The holddown is provided instead by a series of parallel, flexible, closely spaced strips suspended above the web in the heating section and extending in the direction of web travel. The length of the holddown strips in contact with the web may be selectively varied.

Abstract: An apparatus and method for applying variable pressure to a moving surface, such as a moving web of corrugated paperboard. The apparatus includes a frame secured to a fixed structure and located proximate to a heated platform. A number of pressure applicators having movable pressure-applying feet are mounted on the frame. The moving surface moves between the heated platform and the feet of the pressure applicators. The pressure-applying feet are movable in a direction substantially perpendicular to the moving surface. This allows the pressure-applying feet to press the moving surface against the heated platform as the moving surface moves between the heated platform and the feet of the pressure applicators. Each pressure applicator may be independently controlled, typically by an inflatable air bladder, to apply variable pressure to the moving surface.

Abstract: A corrugated paperboard manufacturing apparatus includes one or more preheaters upstream from the double-facer for preheating the component sheets for the corrugated paperboard. A preheater preferably includes an electrically powered heater positioned adjacent a second surface portion of a preheater body for heating the preheater body so that heat is transferred to the component sheet contacting a first surface portion of the body. The first surface portion of the preheater body contacts the component sheet as the component sheet is advanced along the path of travel. The electrically powered heater is positioned adjacent the second surface portion of the preheater body for radiantly heating the preheater body. The temperature of the component sheet delivered to the double-facer from the preheater can be readily controlled to ensure high quality corrugated paperboard. In one embodiment, the preheater body may be provided by a rotating roll.

Abstract: A single facer corrugating machine for improving the gluing effect of the medium paper and the liner includes an elastic press plate for supplying a suitable pressure on the medium paper and the liner after the former is coated with glue on one side, a pressure chamber and a heating plate for providing a suitable pressure and prolonged heating to the glued sheet of medium paper and liner to make them more firmly glued together. The pressure chamber and the heating plate are disposed downstream of the lower corrugating roll and the primary preheating roll in a direction of travel of the glued sheet of medium paper liner. The pressure chamber is filled with a suitable pressure so that the medium paper and liner are more firmly glued together when they are fed between the pressure chamber and the heating plate and are subjected to suitable pressure and heating.

Abstract: An apparatus, for applying a pressing tape to an object by applying pressure to the object, includes a pair of vertically movable members spaced at a certain interval. A tape-shaped material is traveled members and including a supporting tape carrying a pressing tape thereon. A pressure applying device is positioned between the movable members for pressing the tape-shaped member against an object. A tape feed-out device is provided upstream of one of the movable members for feeding out the tape-shaped material therefrom. A tape winding device is positioned downstream of the other movable member, for winding the tape-shaped material thereon. A tape feeding device is positioned between the other movable member and the winding device for feeding the tape-shaped material by a predetermined length by pulling the tape-shaped material. A first chuck is positioned on one movable member for chucking the tape-shaped material.

Abstract: Light weight fabricated metal hot plates in a double backer are initially leveled and maintained flat and coplanar against the forces of thermal distortion by utilizing a dense array of adjustable spring biased support assemblies attached to the underside of the hot plate and securing the plate to an underlying supporting framework. The support assemblies allow horizontal thermal deflection of the hot plate but hold the hot plate heating surfaces firmly against vertical deflection.

Abstract: An apparatus for dispensing a ribbon into a web laminating machine including movable guide arms that move transversely to the direction on movement of the webs and include remote repositioning of the arms and locking means to lock the arms in desired spaced relationship along a guide rail.

Abstract: A double backer for curing the web bonding adhesive and drying the corrugated paperboard web utilizes a web holddown apparatus for maintaining the web in intimate drying contact with the lower heating units which does not require the use of a driven holddown belt. The holddown is provided instead by a series of parallel, flexible, closely spaced strips suspended above the web in the heating section and extending in the direction of web travel. Supplemental holddown force may be provided by banks of spring fingers supported above and in contact with the holddown strips on a transverse support rod which may be rotated to vary the amount of supplemental holddown force. Alternately, the holddown strips may comprise continuous cables in which one run of the cables rests upon the moving web to provide the web holddown and a second run includes high friction cable portions which are movable into driving contact with the upper surface of the web to pull it through the heating section, as for initial web thread up.