Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
  • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
  • B31B50/00—Making rigid or semi-rigid containers, e.g. boxes or cartons
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
  • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
  • B31B50/00—Making rigid or semi-rigid containers, e.g. boxes or cartons
  • B31B50/60—Uniting opposed surfaces or edges; Taping
  • B31B50/62—Uniting opposed surfaces or edges; Taping by adhesives
  • B31B50/624—Applying glue on blanks
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
  • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
  • B05C5/00—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work
  • B05C5/002—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work the work consisting of separate articles
  • B05C5/004—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work the work consisting of separate articles the work consisting of separate rectangular flat articles, e.g. flat sheets
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
  • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
  • B05C5/00—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work
  • B05C5/02—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work the liquid or other fluent material being discharged through an outlet orifice by pressure, e.g. from an outlet device in contact or almost in contact, with the work
  • B05C5/0245—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work the liquid or other fluent material being discharged through an outlet orifice by pressure, e.g. from an outlet device in contact or almost in contact, with the work for applying liquid or other fluent material to a moving work of indefinite length, e.g. to a moving web
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
  • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
  • B31B50/00—Making rigid or semi-rigid containers, e.g. boxes or cartons
  • B31B50/60—Uniting opposed surfaces or edges; Taping
  • B31B50/62—Uniting opposed surfaces or edges; Taping by adhesives
  • B31B50/622—Applying glue on already formed boxes
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T156/00—Adhesive bonding and miscellaneous chemical manufacture
  • Y10T156/10—Methods of surface bonding and/or assembly therefor
  • Y10T156/1002—Methods of surface bonding and/or assembly therefor with permanent bending or reshaping or surface deformation of self sustaining lamina
  • Y10T156/1007—Running or continuous length work
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T156/00—Adhesive bonding and miscellaneous chemical manufacture
  • Y10T156/10—Methods of surface bonding and/or assembly therefor
  • Y10T156/1052—Methods of surface bonding and/or assembly therefor with cutting, punching, tearing or severing
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T156/00—Adhesive bonding and miscellaneous chemical manufacture
  • Y10T156/12—Surface bonding means and/or assembly means with cutting, punching, piercing, severing or tearing
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T156/00—Adhesive bonding and miscellaneous chemical manufacture
  • Y10T156/12—Surface bonding means and/or assembly means with cutting, punching, piercing, severing or tearing
  • Y10T156/1374—Surface bonding means and/or assembly means with cutting, punching, piercing, severing or tearing with means projecting fluid against work
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T156/00—Adhesive bonding and miscellaneous chemical manufacture
  • Y10T156/17—Surface bonding means and/or assemblymeans with work feeding or handling means
  • Y10T156/1702—For plural parts or plural areas of single part
  • Y10T156/1712—Indefinite or running length work
  • Y10T156/1722—Means applying fluent adhesive or adhesive activator material between layers
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T156/00—Adhesive bonding and miscellaneous chemical manufacture
  • Y10T156/17—Surface bonding means and/or assemblymeans with work feeding or handling means
  • Y10T156/1702—For plural parts or plural areas of single part
  • Y10T156/1712—Indefinite or running length work
  • Y10T156/1722—Means applying fluent adhesive or adhesive activator material between layers
  • Y10T156/1724—At spaced areas
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T156/00—Adhesive bonding and miscellaneous chemical manufacture
  • Y10T156/17—Surface bonding means and/or assemblymeans with work feeding or handling means
  • Y10T156/1702—For plural parts or plural areas of single part
  • Y10T156/1712—Indefinite or running length work
  • Y10T156/1722—Means applying fluent adhesive or adhesive activator material between layers
  • Y10T156/1727—Plural indefinite length or running length workpieces

Definitions

• the present invention relates to the application of long-acting adhesive on products made of compact cardboard, corrugated cardboard, or similar material.
• reference will essentially be made to cardboard (compact or corrugated) but only for reasons of simplicity of the description, the invention in no way being limited to this single material.
• Adhesives with a long-acting effect of the type of sealants which are very well cold extruded and which adhere to the supports to which they are applied are known, for example, by virtue of a pressure exerted on them, the invention therefore concerning any adhesive which is sufficiently malleable to be applied hot or cold. Adhesives have reached an excellent degree of efficiency and the trend is towards their generalization replacing other means of assembly.
• the invention is particularly applicable to the manufacture of panels and blanks intended for the creation of containers intended for mail or courier shipments, but also relates to all kinds of applications which require the presence of an adhesive which must be used for a long time. after it has been applied.
• the general problem of fixing with an adhesive can be divided into two families: immediate bonding with glue, and deferred fixing with an adhesive.
• the present invention does not relate to bonding but, on the contrary, to the second family which groups all the cases where one must first deposit an adhesive with prolonged effect (and not an adhesive) on a part, or element, of a support. , then keep the support coated with adhesive, which should only be used later, sometimes very long after its application, to join this first element to a second element, which is often another part of the same product: plate, panel or cardboard blank, for example.
• application surface The place where the adhesive is deposited in the factory is called “application surface” and the place through which a second element must be brought into contact with the same adhesive is called “destination surface”, this last operation most often consisting in closing a container such as a box, with a view to the dispatch by post or courier of articles placed in said container.
• the solution adopted consists in placing on the adhesive already applied a protective tape associated with silicones so that it adheres very little to the adhesive, this protective tape not being removed only at the time of final use, that is to say when it is desired to apply the unmasked adhesive to the surface of the destination, so that it is joined to the application surface, in particular to keep fixed one to the other two parts of the same blank constituting a container such as a box for the shipment of articles by post or courier.
• transfer tapes which include a thick and flexible plastic film, or “core”, or “base”, one face of which is coated with a first adhesive for fixing to the application surface and the other side of which is coated with a second adhesive suitable for fixing the assembly to the destination surface, and covered with a tape removable protection, the base being assumed to be flexible enough to compensate for irregularities in the support.
• the fixing of this transfer tape to the application surface is satisfactory but that, on the other hand, the fixing of the assembly to the destination surface is problematic, even ineffective, even though a transfer tape of this type is of a high price.
• a characteristic example of a material ill-suited to the use of long-lasting adhesive is corrugated cardboard and it is this which is used here to explain the invention, although the latter has numerous other applications to various materials: wood, compact cardboard, synthetic materials, metals, etc.
• the difficulty is relatively low during application in the factory because we try to combine the best conditions of application on new, clean and dust-free products for example, but the difficulty increases considerably when fixing to the surface of destination for two distinct reasons: "the surface of destination could have been damaged or soiled, thus offering a poor grip power, owing to the fact that the support is transported, stored and put on standby for long periods which can reach several months, under varying conditions in terms of temperature, humidity and purity of the atmosphere, which is often handled without precautions; "the removal of the protective tape and the application of the unmasked adhesive on the destination surface can be badly done by a more or less skillful and attentive person, and / or exerting too little manual pressure to ensure an energetic link with the destination surface.
• the beautiful appearance requires a very white and shiny surface, hence the use of a coating or coating, containing for example kaolin or titanium, or constituting a varnish, to the application of printing ink etc. . and in addition to the presence of manufacturing marks detectable only by ultraviolet radiation, which require to be protected by a kind of paint.
• a sheet of corrugated cardboard a complex structure: two corrugated cores and three flat faces, namely two outer and one inner separating the two corrugated cores, for example , which further complicates the use of long-acting adhesive.
• the sheet of corrugated cardboard has a single corrugated core and two so-called “flat” faces.
• the support + adhesive + protective tape assembly is stored, transported, still stored, handled and then distributed, until the actual use of the adhesive that is unmasked at the last moment. , use which is deferred in time compared to the moment when the adhesive was applied to the surface of application of the support.
• the sheet of corrugated cardboard is a constituent part of a blank intended to form a container. It is therefore when the container is closed that the adhesive is needed to join two of its constituent elements, one carrying the application surface filled with the adhesive covered with the protective tape, and the other carrying the destination surface bare. To do this, one end of the protective tape is lifted which detaches more easily from the adhesive than it detaches from the application surface. Also, can we withdraw easily the protective tape to unmask the adhesive in its entirety, the latter remaining integral with the application surface.
• the adhesive On its unobstructed side by removal of the protective tape, the adhesive must have retained its adhesive power so as to allow, by simple contact, to fix the first element of the support to another element of the same support. By thus applying the element carrying the adhesive on an element which does not have one, the two elements are fixed.
• the French standard NF Q 03-030 specifies that the parts of the device
• a good quality adhesive must cling to the cardboard sufficiently strongly, in particular by impregnating it superficially, so that its lifting, even cautiously, causes an irreparable and clearly visible tear, in particular by tearing of fibers constituting the support.
• it is good that the adhesive is present in small quantities.
• the mass production of cardboard, strip, panel or blank products requires that adhesive be applied at running speeds of over one hundred meters per minute.
• the process consists in covering the entire surface of the support to be coated and, for this purpose, several ribbons of the coating product are first placed, then by means of a roller common to all the ribbons, they are spread so that 'they meet and form a complete and continuous coating over the entire surface of the support.
• the support to be coated has no irregularities, on the contrary, since it is a thin extruded sheath, made of flattened synthetic material.
• FR-A-2331 386 which describes an automatic machine for depositing adhesive pads on earthenware tiles and for crushing them by means of a press plate, a weakly adhesive sheet being interposed between the tablets and the press plate .
• the solution described does not allude to the existence of irregularities in the support, or to the fibrous nature of this support, or to the use of a flowable adhesive, or to the creation of a continuous bead, or to lamination. of this cord for its function of equalizing the irregularities of the support.
• US A 1,546,725 which also relates to the manufacture of articles on a machine, from materials whose surface is previously coated with a product incompatible with the adhesive used.
• it is essentially paraffin which is removed from the areas through which the material is bonded to form a box.
• the two flaps from which the paraffin has been removed are fixed to each other immediately after scraping with the same glue and at the same time, so that there is also no distinction between application surface and destination area.
• the present invention overcomes all the drawbacks mentioned above and makes it possible to obtain supports: sheets or panels of any material, provided with an adhesive with prolonged effect for a deferred use of this adhesive and, what, whether the quality of the supports, the regularity or the irregularity of the surfaces present, the existence or absence of surface coating, the fineness or the thickness of the materials used.
• the purpose of products with a long-acting adhesive is to be used easily, by non-professional people and having neither knowledge, experience nor practical means conducive to rational implementation adhesive.
• the subject of the invention is a process for manufacturing a product consisting of a support on which there is a long-acting adhesive and a protective tape for the purpose of deferred use of said adhesive, for joining together by said adhesive two elements of the support, one of which carries a so-called “application” surface and the other a so-called “destination” surface, which consists in causing between said support and a coordinated depositing station of an adhesive and a tape of removable protection, relative movement, preferably by setting in motion the support and not the deposition station, then applying to the application surface, from the deposition station, an adhesive with prolonged effect either in the form of a prefabricated assembly comprising a support, adhesive and a removable protective tape, either in the form of two successive applications of an adhesive alone and then of a removable protective tape only, characterized in that: "we determine ne near the place where the adhesive is deposited, a reference plane located either below the plane in which the underside of a support must be located, or above the plane in which must be find the upper
• the support being a continuous band of indefinite length set in motion and stretched in one plane, one exerts on the band, transversely to itself, a thrust by means of the reference plane itself, so that the tension of the band has the reactive effect of strongly applying said strip against said reference plane;
• the destination surface at least, being insufficiently capable of retaining the long-acting adhesive during the application of the adhesive, that is to say during the bringing together of the two elements to be joined, in particular by rapid application and under moderate manual pressure, due to the internal structure of the support, or else due to an anterior surface treatment of the support, such as a coating and / or a coating having an inhibiting effect on attachment.
• said destination surface is subjected, before it receives by putting in the presence of two elements to assemble the adhesive previously applied to the application surface, a physical, mechanical and / or own chemical treatment to improve the adhesion, either by annihilation, neutralization or attenuation of a rejection effect, or by the addition of a corrective product capable both of being fixed to the destination surface and of retaining the adhesive, or also by action m Mechanical having the effect of lowering the requirements of handling during the implementation of the adhesive;
• the destination surface being made of paper it is subjected to a treatment either during the manufacture of the paper, or after manufacture;
• the destination surface being corrugated cardboard produced from sheets of paper wound in reels, treated and assembled, at least one of the sheets of paper is subjected to the treatment during the production of corrugated cardboard;
• the destination surface being corrugated cardboard produced from sheets of paper wound in reels, treated and assembled, at least one of the sheets of paper situated outside the corrugated board is subjected to the treatment, after obtaining of it; the surface layer carried by the destination surface is at least partially removed without dissociating the original fibers from the support, by light friction and possibly aspiration of the waste removed; > the corrective product is a bonding product between the adhesive and the destination surface; the destination surface having a coating product such as kaolin, there is applied a corrective product capable of passing through the coating product and of attaching directly to the support; > the corrective product is water glue; the destination surface having a soluble coating product, a solvent is applied to it capable of removing at least part of said coating product; the solvent is an acid such as acetic acid; the support and / or the protective tape is subjected to a heat treatment; > the support and / or the protective tape is subjected to an electrical treatment;
• the support and / or the protective flap are passed between electrodes generating a high frequency electric field;
• the protective tape having to receive an impression preceded by a high-frequency treatment, this printing is carried out on the face of the protective raban intended to be applied against the adhesive and the application surface, that is to say upside down, the protective tape must then be transparent to reveal the impression on the other side, by transparency;
• the antagonistic pressure to the transverse force concerns a strip which is located directly above the adhesive and whose width is slightly greater than that which said adhesive must have after it has been applied and spread by pressure;
• the two elements to be joined by the extended-effect adhesive are flaps which are made of corrugated cardboard, that is to say comprising grooves sandwiched between two outer sheets, and which must be brought together by folding the one on the other along fold lines, and there is exerted on the shutter to be located on the other a pressure transverse to its plane sufficient to crush the grooves and thus soften said top flap;
• the pressure opposing the transverse force is calibrated to be greater than the elastic resistance of the material constituting the support;
• the material constituting the support having an internal honeycomb structure, as is the case of corrugated cardboard whose grooves create longitudinal cells, the pressure is calibrated so as to be sufficient to break the walls of the cells forming spacers between two opposite faces of the support, but insufficient to remove any elasticity perpendicular to said faces;
• the material element that is placed on the support is a ribbon; the material that is placed on the support is a chemical;
• the chemical is applied by spraying;
• the chemical is a non-stick type of silicone and is applied in an amount sufficient to cover at least the entire area of application which carries the adhesive;
• the support is sacrificed by cutting it close to the adhesive to be neutralized and eliminating the cut part which carries the adhesive;
• a fluid adhesive dispenser having one or more dispensing orifices
• a protective tape dispenser having: has at least one structure for a coil of protective tape wound in a spiral and having a free strand, "means for unwinding and guiding the free strand,
• an applicator mechanism of said protective raban characterized in that during the operations of applying the adhesive bead, the free strand of the protective raban is positively driven so that its linear speed already before it comes into contact with the adhesive bead already deposited on the support is equal to the linear speed of the support relative to the depositing station, and in that we calender together the bead of malleable adhesive and the protective tape against the support in order to spread laterally at least partially the bead of adhesive malleable interposed between the support and the protective flap, so that the face of said bead of adhesive situated against the protective tape forms in a single plane extending above the highest point of the surface application tape to which the adhesive bead is applied so that the linear speed of the protective flap is equal to that of the support, the protective tape is driven by a mechanical kinematic ems synchronized with the moving support; > the protective flap and the support are made integral by fixing them one to the other; the protective flap and the support are temporarily made integral, without fixing them to each other; the protective flap
• the protective tape when applying the protective tape to the support, the protective tape is secured to the support using immediate-effect glue; the protective tape having a face sensitive to the adhesive and a side not sensitive to the adhesive, it is folded transversely near its free end, in order to fold a short length of the non-sensitive face on itself by a margin and in order to bring the margin of the opposite face sensitive to the adhesive on the face to be in contact with the bead of adhesive previously deposited on the support, so that the protective flap is firmly fixed to said bead of adhesive;
• the storage coil is mounted on an idler axis and its rotation is slowed down; braking is removed when the protective tape is driven upstream of the intermediate stock; > the storage coil is mounted on an axis which is rotated in order to simultaneously obtain the unwinding of the coil turns and the drive of the protective flap to the intermediate stock, and which is immobilized to obtain stopping this course and this training;
• the protective tape is also positively driven after the area in which it is to be cut; the protective flap is extracted at a speed coordinated with the linear speed of the moving support, so that at the place where the protective flap is applied to the support, the speed difference between the protective tape and the speed support is zero; the protective tape is cut in a given area and by means of a rotary cutting member which is operated at a variable rate as a function of the predetermined length for the protective flap segments.
• the invention also relates to a device for manufacturing a product consisting of a support on which there is a long-acting adhesive and a protective tape for deferred use of said adhesive to join by said adhesive two elements of the support including one carries a so-called "application” surface and the other a so-called “destination” surface, this device comprising:
• a machine provided with means for relative movement of a depositing station and of a support, preferably by setting in motion of the support and not of the depositing station, along a linear path in a substantially horizontal plane,
• a reserve of long-acting adhesive and a reserve of protective raban is already associated with each other in the form of a prefabricated assembly comprising a base, adhesive with prolonged effect and a removable protective raban , called “transfer raban”, either separate, reserves which are located close to the mean plane in which the support must be located, device characterized in that it further comprises: • at least one rigid rigid piece constituting a reference plane located outside the plane in which one of the external faces of the support must be and parallel to it,
• the support to be set in motion in the form of a continuous strip stretched longitudinally, the rigid part and the member having an active part are combined into a single assembly consisting of a plate arranged transversely to the machine over the entire width of the path of the support, and one face constituting the active part is located beyond the plane in which one of the two faces of the support must be, so that the continuous strip undergoes across its entire width a transverse force due to the tension which tends to bring it back in a plane located below the active part;
• the support being made up of separate panels, the rigid part and the member having an active part are distinct and arranged on either side of the path of the panels;
• the rigid part is a stationary stop and the member having an active part is a lever urged elastically in the direction of the stop, the active part being constituted by a roller mounted idly at the end of the lever; the lever is connected to a base mounted mobile between two positions, in one of which called “active position" the lever is close enough to the path of the panels so that the roller is
• the base is associated with an automatic control mechanism intended to put the base either in the active position or in the erasing position depending on whether, opposite the roller, there is a panel or an interval between two successive panels;
• the stop is located at the end of an adhesive application head to which a liquid adhesive supply duct coming from the adhesive reserve ends, said head being arranged in the vicinity of the plane in which must be find one of the faces of the support;
• the destination surface at least, being insufficiently capable of retaining the long-acting adhesive when the two elements of the support to be joined are brought together, in particular by rapid application and under moderate manual pressure, for example due to the presence on the support of a film of synthetic material or of a coating such as a synthetic material, silicone in particular, a varnish or kaolin, having an adhesive inhibiting effect
• the machine comprises means to subject the destination surface, at least, before its meeting with the interposed adhesive, to a physical and / or chemical treatment capable of improving adhesion, either by annihilation, neutralization or attenuation of a
• the machine is provided with a suction mechanism having a mouth located near the organ with a rough surface, in order to evacuate waste created by the slight erosion of the surface layer; the machine is equipped with a heat treatment unit which must receive at least part of the protective tape immediately before its application to the support;
• the machine is equipped with an electrical processing assembly which must subject at least one of the two elements of the support to be brought into contact, before their meeting, with a high frequency electric field;
• the electrical treatment assembly comprises two electrodes which must generate between them a high frequency electric field and between which at least one of the two elements must pass, which must be brought together and brought together;
• the machine comprises means for printing the protective flap located downstream of the electrical processing assembly, considering the relative direction of movement between the support and the printing means;
• the device is produced in the form of a machine comprising:
• an input feeder to receive the cardboard or similar material support, which is in the form of separate, independent panels stacked on the feeder and previously cut to the desired format and shape in the form of blanks,
• the machine further comprises: • a raban dispenser for protection of the long-acting adhesive, either alone or already associated with a prefabricated assembly comprising a base, adhesive and a removable protective tape, which is very long in the form of coils, A mechanism for cutting said protective flap coordinated with the movement of the blanks in order to cut the protective flap near the two transverse ends of each blank,
• an input feeder to receive the cardboard or similar material support, which is in the form of separate panels stacked on the feeder and previously cut to the desired format and shape in the form of blanks, • a guide path for the blanks one behind the other, a path which extends to a conveyor leading to an output stacker, and it is characterized in that the machine further comprises:
• a dispenser for a protective effect of the adhesive with prolonged effect either alone or already associated with a prefabricated assembly comprising a base, adhesive and a removable protective raban, which is produced in great length in the form of coils,
• a mechanism for cutting said protective tape which is coordinated with the application mechanism for cutting the tape in segments each located inside the outline of a blank
• a device incorporating means for applying a treatment either to the support alone, or to the protective flap alone, or to both; the device is produced in the form of a machine which is a corrugator comprising: • a set of constituting a corrugated cardboard support from reels of paper, support which is in the form of a broad, substantially horizontal continuous strip of length indefinite,
• At least one head for applying an adhesive with a long-lasting effect alone At least one head for applying an adhesive with a long-lasting effect alone
• the distributor or distributors of protective raban either alone or already associated with a prefabricated assembly comprising a base, adhesive and a removable protective tape, as well as the device or devices incorporating the means for applying a treatment are located above the horizontal continuous strip, the long-acting adhesive and the protective tape then having to be applied to the upper face of said continuous strip;
• the protective flap distributor (s) as well as the device (s) incorporating the means for applying a treatment are located below the horizontal continuous strip, the long-acting adhesive and the protective flap then having to be applied to the underside of the continuous strip;
• the device is intended to apply malleable adhesive and a protective flap separately, and comprises a dispensing orifice of malleable adhesive, storage and unwinding members of the protective raban, as well as an application mechanism of said protective flap on the support, at least in part on the adhesive, mechanism which is arranged downstream of the adhesive dispensing orifice considering the direction of relative movement, device characterized in that it is provided with '' at least one detector of the presence of a protective flap, the sensitive element of which is located downstream of the adhesive dispensing orifice and which is connected to an alarm as well as possibly to an automatic mechanism intended to return the adhesive inoperative, either by withdrawal or by adding a material element; the device is provided with a mechanism for removing the adhesive which comprises at least one movable ploughshare between a waiting position in which it is located away from the support, and an active position in which it is located above beyond the plane of the support on which the adhesive is already applied, possibly automatic means being provided for passing the share from one position to the other; the device is provided with an adhesive removal mechanism
• a malleable adhesive dispenser having one or more dispensing orifices
• a protective raban dispenser having: "at least one support for a reel of ribbon wound in a spiral and having a free strand," means for unwinding and guiding the free strand, "an applicator mechanism, is characterized in that the depositing station includes:
• the machine is equipped with an assembly for the application to the support of a product such as glue with immediate effect, a solvent, a varnish and the like, and which comprises a reservoir for the product, at least one connected conduit on the one hand to the reservoir and on the other hand to at least one outlet nozzle, the orifice of which is located near the path which the support must follow
• the side parts must be applied to the protective flap interposed between said side parts and the support; the side parts have a non-smooth surface;
• the half-difference in the diameters of the central part and of the two lateral parts is less than the total thickness of the protective tape and the bead of adhesive previously deposited on the support, in order to determine by laminating the thickness of said bead 'adhesive;
• the pressure roller is rotatably mounted on a movable assembly associated with control means by which the pressure roller can be placed in one of two extreme positions, one called “spacing” in which the roller pressure is away from the support, and the other known as “active” in which it is in contact with the support, by exerting on it a pressure which may be adjustable;
• the mobile assembly is connected to a pneumatic control cylinder, so that the thrust of the cylinder on the mobile assembly is somewhat elastic;
• the device comprises means for fixing the protective flap to the support in order to make them integral independently of the adhesive deposited on said support;
• the fixing means consist of a glue dispenser with immediate effect;
• the fixing means consist of a mechanism for cutting and transversely folding the protective tape, intended to fold a short length of said protective raban from a free end, so that in the folded part one side of the protective tape sensitive to the adhesive is folded back on itself and that the opposite face which is more sensitive to the adhesive has a certain length on the same side of the protective flap as the face which is less sensitive to the adhesive;
• the device being intended to apply separately from the malleable adhesive and a protective tape, it comprises a rectangular receptacle determined by six faces, four small faces and two large parallel faces spaced a distance slightly greater than the width of the protective tape, two opposite small faces each having a passage, one of which is an entrance into which the free strand of the raban must be engaged protection from a storage reel, the other of which constitutes an outlet through which the free strand of the protective tape must pass, motor means being provided to set in motion and guide the protective flap on the one hand from the storage reel to the inlet of the receptacle and on the other hand from the outlet of the receptacle to the depositing station, means which are coordinated to lead a length of protective tape from the reel to the inlet of the receptacle substantially equal to that which is led from the outlet of the receptacle to the depositing station, so that there is permanently in the receptacle a substantial length of loose protective flap, that is to say say not wound on itself, and arranged in large fold
• the motor means are associated with a measuring instrument which makes it possible to determine the length of protective tape present in the receptacle, and which controls the operation of the pair of rollers so that the length driven towards the inlet is substantially equal to the length driven beyond the outlet.
• the storage coil is rotatably mounted on an axis and is associated with a braking mechanism
• the device comprises a pilot roller against which carries the part of the protective flap situated between the storage reel and the inlet of the receptacle when said protective tape is stretched, the pilot roller being in functional relation with the braking mechanism so that the latter is neutralized when the protective flap bears against the pilot roller and is put into braking action of the reel as soon as the protective tape is relaxed and no longer bears against said pilot roller;
• the storage coil is rotatably mounted on an axis and kinematically connected to a motor;
• the pilot roller is in functional relation with the motor so that the speed of the latter is controlled at a speed advantageously adjustable when the protective tape bears against the pilot roller and is stopped as soon as the protective tape is relaxed and no longer bears against said pilot roller;
• the braking mechanism of the storage coil is constantly in action and the motor means have sufficient power to overcome the resistance force due to said braking mechanism;
• this device comprises on the one hand a mechanism for cutting the protective raban in successive segments, located between the spool and the depositing station, and on the other hand a device for measuring the length of the surface for application of the support which must receive adhesive and a segment of protective flap, in order to cut said segment accordingly to the desired length before it is fully disposed on the support so that it is separated from the turns of the coil, the device further comprising motor means for setting in motion and guiding the protective flap d on the one hand before cutting from the spool to the cutting mechanism and on the other hand after cutting from the cutting mechanism to the depositing station, the cutting mechanism comprising a cutting member ant movable between an erasing position in which it is away from the path of the protective flap and an active position in which it is very fleetingly on this path, member which is integral with a movable element whose speed displacement from the active cutting position of a segment
• the deposition station comprising a pressure roller rotatably mounted and located in the immediate vicinity of the place where the protective tape must dock the support and the adhesive bead deposited on it, the distance that exists between the pair of rollers located between the output of the cutting mechanism and the pressure roller is less than the length of the shortest admissible segment.
• the subject of the invention is also a product, in particular a fibrous product, which consists of a piece of cardboard, corrugated cardboard, or similar material, such as a simple panel, a cut, grooved and optionally printed blank which may have folded and glued parts, or another article in volume such as a container, characterized in that this part has at least one weakly adherent tape disposed over a bead of adhesive with prolonged effect applied to at least one first element of the part which constitutes an area said "application surface", in the presence of which must be, after folding and / or partial straightening, a second element of the part along a face called “destination surface” stripped of adhesive and therefore of protective flap, this destination surface with greater adhesive retention capacity than the rest of the part.
• at least part of the destination surface has traces of a previous treatment, such as surface condition, localized excess thickness, hollows, irregularities, color or micro perforations;
• At least part of the destination surface is less smooth than the rest of the part; at least part of the destination surface has a layer of a product; the elements to be brought into contact are shutters to be folded along lines, at least some of these have perforations which pass right through the constituent material of the shutters and which are separated by solid parts;
• the elements to be brought into contact are flaps to be folded and folded over one another along lines, these are located, for two neighboring flaps, at non-aligned levels so that after folding and folding , the fold line of the top flap is higher than that of the bottom flap at a distance greater than the thickness of the material forming the flaps, so that the top flap is slightly inclined relative to the bottom flap, and not strictly parallel to it;
• the element carrying the destination surface is softer and more flexible than the rest of the part;
• the element carrying the application surface has on its face opposite to said application surface, a trace at the right of which the corrugated cardboard is softer due to the breakage of its internal grooves at the right of the trace;
• the long-acting adhesive is covered with a protective flap slightly wider than the adhesive;
• the long-acting adhesive is covered with a protective tape whose ends exactly coincide with the edges of the part;
• the long-acting adhesive is covered with a protective tape, at least one end of which extends beyond one of the edges of the part;
• the long-acting adhesive and the protective flap are placed in a hollow which the part presents, so that the external face of the tape is substantially aligned with the face of the part, without creating any additional thickness;
• the protective flap is transparent and bears inscriptions affixed to its face situated against the long-acting adhesive; > the protective tape is secured to the cardboard piece not only by the long-acting adhesive itself but also by additional means;
• the cardboard piece carries at least one bead of long-acting adhesive covered with a protective tape secured to the piece of cardboard by at least one mechanical fixing member such as needle, staple and the like;
• the cardboard part carries at least one bead of long-acting adhesive covered with a protective flap secured to the cardboard part by immediate effect glue deposited in at least one location.
• Figure 1 is a schematic view of a device according to the invention, applied to obtaining separate panels each having at least one line of adhesive.
• Figure 2 is a partial schematic view showing a device according to the invention ensuring the accuracy of the positioning of the successive panels relative to a depositing station, when a panel is vertically in line with a delivery head of liquid adhesive.
• Figure 3 is a schematic view similar to that of Figure 2, which shows the phase of obtaining the panels according to which there is an empty space below the adhesive delivery head.
• Figure 4 is a schematic view of a device according to the invention, applied to obtain a strip of indefinite length having at least one line of adhesive.
• FIG. 5 is a partial schematic view corresponding to that of FIG.
• FIG. 6 is a partial schematic view showing the closure of a container by folding down two hinged flaps, one of which carries adhesive with prolonged effect.
• Figure 7 is a schematic view of the container of Figure 1 after closing.
• FIG. 8 illustrates the "chewing gum effect" and the beginning of the stretching of the adhesive, as a result of the combined action of the two flaps subjected to a force of return to the original plane position.
• Figure 9 illustrates the sudden opening of the container when the opening force exceeds the adhesive retention force.
• Figure 10 is a schematic plan view of a flat container blank, cut and grooved for the volume of a container, here a box, for shipping by post or courier articles qu 'it contains a blank on which long-lasting adhesive must be applied as well as a protective flap.
• Figure 11 is a schematic plan view of a blank from the blank of Figure 10, after it has been folded in half and fixed with glue arranged on an assembly tab.
• FIG. 12 is a schematic perspective view of a box being set in volume, from the blank of FIG. 11.
• Figure 13 is a schematic perspective view of the box of Figure 12, set in volume and ready to be closed by the long-acting adhesive.
• Figure 14 is a schematic perspective view of the box of Figures 12 and 13 after closing, and ready for transport but exposed to the risk of accidental opening if it is not treated according to the present invention.
• FIG. 15 is a blank identical to that of FIG. 10 and treated in accordance with the invention, before application of adhesive with prolonged effect and which must then give rise to a blank similar to that of FIG. 11, then to a box similar to that of Figures 11 and 12, without danger of accidental opening.
• Figures 16 to 20 are schematic views of a container of known type, allowing the packaging of objects of various heights, and having to be kept in volume and closed with long-acting adhesive.
• FIG. 16 we see a flat blank, simply cut and grooved, to receive adhesive with long-lasting effect and a protective tape.
• Figure 17 we see a blank from the blank of Figure 16 and having a folded and partially glued part, in order to constitute a container with variable height, intended for dispatch by post or courier.
• Figure 18 is a schematic perspective view of a container obtained by volume setting of the blank of Figure 17 and being closed for packaging a book.
• Figure 19 is a schematic perspective view of the container of Figure 18, ready to be closed by means of long-acting adhesive.
• Figure 20 is a schematic perspective view of the container of Figures 18 and 19, but exposed to the risk of accidental opening if not treated according to the present invention.
• Figure 21 is a blank similar to that of Figure 17 to give rise to a container similar to that of Figures 18 to 20, but without danger of accidental opening, as treated according to the invention, before application of adhesive to prolonged effect.
• FIG. 22 is a schematic view illustrating a device implementing the method according to the invention for the application of long-acting adhesive and a protective tape on corrugated cardboard in precut panels, in grooved blanks or in blanks during folding and assembly by partial gluing, in accordance with a particular embodiment of the invention according to which pressure is exerted, through the protective flap, on the long-acting adhesive.
• Figure 23 is a schematic view on a larger scale of a part of the device of Figure 22, specific to this particular embodiment.
• Figures 24 to 26 are schematic views illustrating this particular embodiment applied to the adhesive deposited in the form of a single relatively thick bead.
• FIG. 24 is a section seen along the line XLII - XLII of FIG. 23, and
• FIG. 25 is a section seen along the line XLIII - XLIII of this same figure 23.
• FIGS. 27 to 29 are schematic views illustrating the same embodiment of the invention, but using prolonged effect adhesive applied according to several small beads, and on the upper face of the support.
• Figures 30 to 32 are schematic views illustrating the same embodiment of the invention as that of Figures 27 and 29 but with which one does not exert sufficient pressure to spread the beads of adhesive.
• Figures 33 to 35 are schematic views illustrating a variant of the same embodiment of the invention using prolonged-effect adhesive applied according to several small beads, but on the underside of the support.
• FIG. 36 is a schematic elevation view of a machine according to the invention, intended for the application of long-acting adhesive and a protective flap on unitary supports constituted by corrugated cardboard panels coming from the cutting either of a strip of corrugated cardboard of indefinite length, or of larger plates.
• FIG. 37 is a partial schematic perspective view illustrating a variant of the invention according to which an erosion layer is removed from the support which constitutes the support and which is not very suitable for retention of long-acting adhesive before application of said adhesive.
• FIG. 38 is a partial schematic perspective view illustrating a variant of the invention according to which an additional product is spread over the part of the support constituting the application surface, the surface of which is hardly suitable for the retention of adhesive with prolonged effect , before applying said adhesive.
• FIG. 39 is a partial schematic perspective view illustrating a variant of the invention according to which the part of the support constituting the application surface is subjected, the surface of which is hardly suitable for the retention of adhesive with prolonged effect, to a field electric, before applying said adhesive.
• FIG. 40 is a schematic elevation view of a machine according to the invention, intended for the application of long-acting adhesive and of a protective flap on a support constituted by a strip of corrugated cardboard of indefinite length , originating from the continuous constitution of this corrugated cardboard from paper reels, this machine being known by the name of "corrugator”.
• Figure 41 is a partial schematic view of a machine comprising an adhesive application device and a protective flap, in normal operation.
• Figure 42 is a schematic view similar to that of Figure 41 illustrating the occurrence of an incident consisting of the rupture of the protective flap.
• FIG. 43 is a schematic view of an embodiment of the invention implemented when the incident illustrated in FIG. 42 occurs.
• Figure 44 is a view similar to that of Figure 43, and corresponding to another embodiment of the invention.
• Figure 45 is a view similar to those of Figures 43 and 44, and corresponding to another embodiment of the invention.
• Figure 46 is a view similar to those of Figures 43, 44 and 45, and corresponding to another embodiment of the invention, according to two variants.
• Figures 47 to 54 are schematic views which illustrate an embodiment of the invention in which the precision of application of the long-acting adhesive and the protective tape is obtained by synchronizing the linear speeds of the moving support and protective tape extracted from its reserve, thanks to a pressure roller driven in rotation.
• FIGS 47 and 48 illustrate the situation in which the support is not present.
• Figures 49 and 50 illustrate the situation in which the support is present below the pressure roller, before removing the adhesive.
• Figures 51 and 52 illustrate a special situation, in which the protective flap is already driven by the pressure roller but the adhesive lags behind it because it only arrives at the deposition station.
• FIGS. 53 and 54 illustrate the current operating situation, according to which the support is present and receives the malleable adhesive as well as the protective tape.
• Figure 55 is a schematic view showing that the pressure roller can be knurled in its middle part.
• Figure 56 is a schematic view showing that the pressure roller can be knurled on either side of its middle part.
• Figures 57 and 58 are schematic views illustrating two variants of the invention with respect to the application by the pressure roller of the long-acting adhesive and the protective flap.
• FIG. 59 is a schematic view illustrating an embodiment of the invention according to which the pressure roller is rotated by means of a belt-type transmission member.
• Figure 60 is a schematic elevational view illustrating an embodiment of the invention according to which the pressure roller is rotated by a mechanism comprising a roller - motor itself driven by the moving support.
• Figure 61 is a schematic elevational view similar to Figure 60, the mechanism being here in the erasing position, the moving support is not present at the base of the pressure roller.
• FIG. 62 is a schematic perspective view of the mechanism of FIGS. 60 and 61.
• FIG. 63 is a schematic view illustrating an embodiment of the invention according to which an intermediate stock is provided between the storage reel for the protective tape and the deposition station.
• FIG. 64 is a schematic view illustrating an embodiment of the invention according to which a mechanism for measuring and cutting the protective tape is provided near the deposition station.
• a mechanism for measuring and cutting the protective tape is provided near the deposition station.
• FIGS. 1 to 3 we see a heated and insulated reservoir 1, in which a certain amount of adhesive 2 is heated to bring it to a consistency according to which it is still pasty but at the limit of the liquid state, a situation that we describe as “malleable”.
• a certain amount of adhesive 2 is heated to bring it to a consistency according to which it is still pasty but at the limit of the liquid state, a situation that we describe as “malleable”.
• an adhesive of known type is heated to about 175 degrees Celsius, the important thing being to bring the adhesive to the temperature necessary so that it has a viscosity compatible with its easy and continuous extrusion.
• the adhesive 2 is brought to an orifice 4 opening above the plane in which the upper face of the various panels 5 must each be located, each constituting a support to receive the malleable adhesive 2 and a protective tape.
• the orifice 4 is located at an invariable level N, either that the duct 3 is fixed, or that the orifice 4 is provided on a head 6 itself fixedly arranged, or if it is movable for the purpose of maintenance and / or adjustment, subject once and for all, possibly in abutment, to the given level N.
• the face of the panels 5 which must receive the adhesive 2, called “application surface”, here is their upper face , must extend in a plane located at a distance as precise as possible from the orifice 4.
• the distance Dl which separates the level N from the application face is critical in order to obtain that the adhesive 2 is applied correctly, both for fixing it to the application surface, in the factory, and for its subsequent real and effective action on the destination surface.
• a reference plane P is determined located at the distance Dl from that in which the application surface must be located, and a transverse force is exerted on the panels 5 so that their upper face is constantly applied. against the plane P.
• the plane P is formed by the lower face of a rigid part 7 constituting a stop and distinct from the end of the conduit 3 where the orifice 4 is located.
• the orifice 4 is provided on an application head 6 of adhesive 2 and is located at the end of a channel 8 inclined downwards from back to front, to lead to the downstream part of the head 6, relative to the direction of movement of the panels 5 indicated by the arrows FI.
• the reference plane P is provided here on the head 6 itself, the flat and smooth underside of which constitutes the stop against which the application face must be constantly maintained, for all successive panels 5 having the same thickness.
• the head 6 has a rear transverse step 9 of rounded shape.
• the transverse force is obtained by means of a support roller 10 which constitutes an active part and which is mounted idly on an axis 11 situated at the end of a lever 12 connected to a base 13 mounted pivotally movable between two positions.
• the lever 12 is in the active position, that is to say that the base 13 has been driven (by a mechanism of known type, not shown) in pivoting according to arrow F2, so that the roller 10 is applied elastically but energetically against the underside of the panels 5 (FIG. 2), while in FIG. 3, the base 13 has been pivoted in opposite directions so that the roller is in the erasing position, it that is to say away from the place where the lower face of the panels must be located.
• the stop 7 and the active part 10 are situated on either side of the path of the panels 5.
• the stop and the active part are combined into a single fixed part 16 placed transversely.
• the transverse force is obtained by positioning the part 16 at a level higher than that which the continuous strip 15 would occupy without it, because the latter being very long and flexible, it can be slightly deviated from its normal course, so that its natural tension, exerted by the rounder due to the very functions of its various mechanized stations, constantly applies it against the upper face of the part 16.
• this embodiment is particularly advantageous to install on a corrugator, because the length of the strip, its speed which often varies and the nature of the means for driving the strip, have the effect of creating beats of the strip perpendicular to its plane, and the tension maintenance provided by the part 16 a with the happy consequence of attenuating if not suppressing these beats.
• the upper face of the part 16 is slightly at the back of the donkey so as not to create excessive stresses on the strip 15, the application of adhesive 2 being carried out near the part 16 and downstream. of the latter, relative to the direction of movement of the continuous strip 15, indicated by the arrow FI.
• FIG. 4 the upper face of the part 16 is slightly at the back of the donkey so as not to create excessive stresses on the strip 15, the application of adhesive 2 being carried out near the part 16 and downstream. of the latter, relative to the direction of movement of the continuous strip 15, indicated by the arrow FI.
• an application head 6 is situated directly above the part 16, but the latter being inelastic and fixed, the distance Dl which separates the level of the orifice 4 from the plane P must be able to be adjusted by precisely so that strips of corrugated cardboard of different thicknesses can be used. For a given type of corrugated cardboard, the distance Dl is adjusted once and for all, checked and possibly corrected periodically.
• the upstream 17 and downstream 18 transverse faces of the part 16 are rounded to facilitate movement of the continuous strip 15.
• long-acting adhesive applies particularly well to containers intended for mail or courier shipments, but also relates to all kinds of applications which require the joining of two elements by an adhesive, even long after it it has been applied to one of these elements. It is known, in fact, that only an adhesive makes it possible to join two elements in an inviolable manner, in particular to maintain in volume and close a container obtained by folding a blank previously cut and grooved.
• prefabricated plinths made of wood or synthetic material, one side of which is decorative and the other, intended to be fixed to a wall, receives one or more strips of very thick, long-acting adhesive, sparingly covered. precise with silicone paper.
• the folding must be easy and the line along which the flaps must be folded is marked in advance, during the manufacture of the blank, by means of a "refouling net” which is a non-acute blade integrated into the shape cutting and which being less high than the cutting blades only makes a simple creasing, that is to say a marking not traversing.
• a "refouling net” which is a non-acute blade integrated into the shape cutting and which being less high than the cutting blades only makes a simple creasing, that is to say a marking not traversing.
• the creasing must not weaken the cardboard too much, because the closed container could then open during its handling by cutting along the creasing line forming after folding a sharp edge of the container. It follows that with the current knowledge of the skilled person and with known techniques, it is preferable that the cardboard remains practically intact in terms of its mechanical strength and that it retains nerve, even if this has as a consequence of constantly tending to return the cardboard to its original, flat position, by urging the flaps towards their open position.
• the long-acting adhesive on the other hand, always retains a certain elasticity since, precisely, it is designed not to solidify.
• a “chewing gum effect” then occurs, which manifests itself by a slow detachment of the adhesive, by filaments which stretch and which weaken the junction by peeling one by one, imperceptibly but inevitably, in particular as a function of time. and room temperature.
• This phenomenon is easy to verify with a ball of chewing gum dropped to the ground and on which one involuntarily walks: it is practically impossible to take off entirely as well from the pavement as from the sole of the shoe other than by chemical dissolution, but it is lengthens and, while being releasable, would be incapable of behaving like a resistant adhesive having to hold two elements one against the other.
• the peeling effort developed by hand is relatively low because it is exerted against the length of the cord on tens of centimeters of resistance, while the natural effort of opening is exerted against the width of the cord, only two or three centimeters, and over its entire length.
• the problem which arises is therefore not only that of the quality of the adhesive but that of the capacity of the support to vigorously retain the adhesive applied against it, whether this support is the application surface or the destination surface. .
• the word “support” means an element which must be associated with the adhesive: application surface, destination surface or protective flap.
• the adhesion parameters between the adhesive and the protective tape are different from those of the adhesion between the adhesive and the elements to be joined because in the first case the protective flap is removable and its attachment cannot be only temporary since it must be able to be easily removed while, on the contrary, the fixing of the elements by the interposed adhesive must be final, irreversible. The fact remains that it is still the same problem of adhesive retention.
• the invention recommends a method which makes it possible to obtain a new solution for carrying out these different phases, either by using a prefabricated transfer ribbon, either by making the ribbon on site, on demand, by applying the long-acting adhesive directly to the support, and by covering this adhesive with the protective flap.
• This process consists in giving a support adhesive retention qualities that it does not currently have, taking into account the characteristics of the raw materials used.
• postal and courier services use boxes that are set up one by one, as and when required for shipping.
• the shipping offices have blanks delivered flat to occupy the minimum storage volume, and sometimes partly mounted by partial folding and gluing of tab (s), or by joining two neighboring walls edge to edge at using a permanently bonded ribbon.
• the tab is folded and glued in the factory, during the manufacture of the blank from corrugated cardboard blanks, by efficient industrial means which make it possible, in particular, to use a hot or cold liquid adhesive impregnating the cardboard which receives it, as well as the folded cardboard and folded over it before it has solidified.
• corrugated cardboard of the “double-sided” type comprises three sheets of paper: two outer flat sheets and a central corrugated sheet to form grooves which brace and stiffen the two outer sheets glued to the grooves.
• corrugated cardboards have papers of different qualities, in particular an ordinary quality sheet which must constitute the internal face of the products manufactured subsequently, and a better quality sheet to constitute the other face opposite to the previous one. , intended to constitute the visible part of these products.
• the corrugated central sheet is also chosen according to the aim sought which is here the desired mechanical strength. In order to give it a shiny appearance, paper made with bleached pulp can be improved by adding a product, often kaolin, which gives white paper a glossy appearance.
• FIGS 6 to 9 illustrate the detachment phenomenon that the invention combats.
• FIG. 6 a box can be seen, the body 201 of which closes by means of two flaps 202 and 203 folded over one another by pivoting along fold lines 204 and 205.
• the upper flap 203 carries an adhesive to extended effect 2 which was covered by a protective flap, not shown in that it was removed to unmask the adhesive 2.
• the flap 203 is folded over it in the direction of arrow F5.
• the adhesive 2 is fixed to the shutter 202 and the box is closed, as shown in FIG. 7. Constantly, the nerve of the cardboard requests the straightening of the shutter 202 in the direction of the arrow F6 and pushes the shutter 203 in the direction of arrow F7, thus adding its action to that which is specific to the nerve of flap 203.
• the adhesive 2 having been placed in the factory on the flap 203, which is the application surface, hot and with industrial means, it adheres much better to the flap 203 than to the flap
• the method of the present invention aims to lower this cost price by increasing the retention capacity over time of the elements present, thanks to which it is possible to obtain a very effective action of the long-acting adhesive 2 which can be obtained. use in significantly lower amounts.
• the operation can be carried out before, during or after the constitution of the complete support. If it is corrugated cardboard, it is possible to carry out a treatment of the original paper which has to form at least one of the two faces of this corrugated cardboard, or even to carry out a treatment of the pulp from which the paper will come. The most likely concrete situation is to deal with the support already made, namely plates, panels or blanks cut from corrugated cardboard.
• this coating is generally obtained by means of kaolin or titanium, or an equivalent mixture, constituting a barrier layer which, interposed between the fibers of the bare paper and the adhesive 2 which it is desired to deposit therein, s opposes the penetration of the adhesive 2 into the fibers of the paper and therefore its energetic anchoring, whether it is the application surface or the destination surface.
• FIG. 10 we see an embodiment of a real box.
• a corrugated cardboard plate we cut out the blank of figure 10 which shows the internal face of the plate, and which is generally in paper of lower quality than that of the paper of the opposite face (external face) which, on this figure 10, is the hidden side.
• the hidden side is moreover often treated to have an excellent appearance, in particular of white color, and carries mentions and printed graphics.
• the blank of FIG. 10 presents two large panels 211 and 212, two transverse walls 213 and 214 and a bonding tab 215.
• the large panels 211 and 212 are integral with side walls 216-217 and 218-219, and the transverse walls 213 and 214 are integral with connecting lugs 221-222 and 223-224.
• the inner face of the side walls 216 and 217 carries a segment of long-acting adhesive 2 covered with a protective flap 20. The part of these walls 216 and 217 which receives the adhesive 2 constitutes the application surface.
• glue (not visible in the drawing) is applied to the adhesive tab 215 and / or under the large panel 212, then the blank is folded transversely on itself to give rise to the blank of FIG. 11 which constitutes the object delivered and stored flat and ready to constitute a box in volume.
• the blank in FIG. 11 is developed in parallelogram, then the protective tape 20 is removed from the side wall 217, then the connecting tabs 222 and 224 are folded back, then the side wall 219 is folded down on the tabs 222 and 224, then the side wall 217 is folded over the side wall 219 and the wall 217 is pressed hard enough by hand to obtain the joining of the two walls 217 and 219 by the long-acting adhesive 2 ( figure 12).
• the box of FIG. 13 is thus obtained which is still open by its small face formed by the walls 216 and 218, opposite the small face formed by the walls 217 and 219 which has been closed with the adhesive 2.
• the protective flap 20 is removed from the side wall 216, then the connecting tabs 221 and 223 are folded, then the wall is folded down side 218 on the legs 221 and 223, then the side wall 216 is folded over the side wall 218 and it is pressed hard enough on this wall 216 to obtain the joining of the two walls 216 and 218 by the long-acting adhesive 2 (figure 13). This gives the box of Figure 14 which is ready to be shipped.
• the outer face of the walls 218 and 219 constitutes the destination surface because it is it which receives the inner face of the walls 216 and 217 with the interposition of the long-acting adhesive 2 ( Figures 12 and 13).
• a specific treatment is carried out which, with the example of FIGS. 10 to 14, is located on the destination surface, that is to say the external face of the walls 218 and 219.
• the destination surface of the wall 219 has not been shown, but in FIG. 13 the traces left by a physical operation such as scraping have been indicated by the reference 230, as will be described in details later.
• This operation has the effect of making the destination surface more capable of retaining the adhesive 2, in order to prevent the accidental opening of the box which has been explained with reference to FIGS. 6 to 9, so that the box closed in Figure 14 can be safely shipped without any other precautions and can even receive heavier items than those usually accepted with this type of container.
• the blank of my figure 11 After manufacturing in the factory, the blank of my figure 11, it is sent to a place of use where it can stay relatively long before being used, in random conditions, variable from one place to another, as to the atmospheric conditions of the storage room: humidity, temperature, dusty atmosphere, etc.
• the adhesive 2 Since the adhesive 2 is protected by the tape 20, it does not suffer too much from poor storage conditions, while the critical zone is the destination surface, which remains bare and exposed. To keep the blanks in good condition, it is therefore good to treat this destination surface, for example to make it anti-static in order to prevent the deposition and retention of dust, and more generally to carry out an anti- dust, for example using a product sprayed on this destination surface, and / or wiping the destination surface shortly before removing the protective tape and applying the adhesive 2 on said destination surface. It is also possible to mask at least partially the destination surface by means of a removable raban which can be identical or similar to the protective raban 20, that is to say weakly adherent, and fixed by means of a very weak amount of adhesive deposited on the destination surface.
• a removable raban which can be identical or similar to the protective raban 20, that is to say weakly adherent, and fixed by means of a very weak amount of adhesive deposited on the destination surface.
• This particular raban can be marked and bear statements relating to its removal necessary to close the container from the blank, and / or to a particular guarantee of good adhesion, and therefore of high quality tamper-evident closure.
• the application surface (internal surface) must be treated in addition to or in place of the destination surface (external surface).
• FIG. 15 shows the blank of FIG. 10 before application of the long-acting adhesive 2 and after a treatment such as a scraping which leaves traces 230 on the face internal of the two walls 216 and 217.
• Figures 16 to 20 show another example of application of the invention no longer to a fixed volume box but to a variable height envelope capable of adapting to articles of different thicknesses, in particular more or less bulky books and / or in greater or lesser number.
• FIG. 16 shows the internal face of the plate, and which is generally made of paper of lower quality than that of the paper of the opposite face (external face) which, on this figure 16, is the hidden side.
• the hidden side is moreover often treated to have an excellent appearance, in particular of white color, and carries mentions and printed graphics.
• the blank of Figure 16 has two uneven rectangular panels 241 and 242, separated by a transverse line formed by a central slot 243 and two fold lines 244 and 245 located at the ends of the slot 243. To ensure a sharp fold and precise, the central slot 243 is interrupted by two uncut bridges 246.
• the end panel 242 is separated into two flaps 247 and 248 by a longitudinal cutting line 249 interrupted by two uncut bridges 251 and 252 ensuring the joining of the two flaps 247 and 248, and by a central opening 253 whose purpose is explained further.
• the flaps 247 and 248 have two longitudinal fold lines 254 and 255 determining two lateral edges 256 and 257.
• Glue dots 260 are placed along the longitudinal margins of panel 241 over a length corresponding to that of panel 242, then panel 242 is folded over panel 241, they are pressed and fixed against each other thanks to the glue dots 260 which join the panel 241 and the edges 256 and 257.
• adhesive is applied extended effect 2 which is covered with a protective tape 20, the margin of the panel 241 receiving this adhesive 2 constituting the application surface.
• the panel 241 While holding these ends against the book A, the panel 241 is turned over, according to arrow F8, the assembly constituted by the base 261, the book A and the folded flaps 247 and 248, the panel 241 folding transversely exactly at plumb with the ends of the side edges 256 and 257, then after removing the protective tape 20, the free end of the panel 241 is folded down according to arrow F9 in FIG. 19 which shows both the application surface bearing the adhesive 2 and the destination surface formed by the external face of the base 261.
• the dimensions of the external face of the base 261 are perfectly known since they correspond to those of the end panel 242.
• the length L1 of the free end of the panel 241 is not known because it depends on the height H, itself a function of the thickness of the packaged articles. Consequently, it is not known exactly where the adhesive 2 will be applied against the external face of the base 261 and it is not possible to locate precisely the destination surface which must be treated.
• FIGS. 10 to 14 on the contrary, it is known exactly before the volume of the box and the placement of the articles to be packaged where the destination surface is located because the box has invariable dimensions, this which is not, by definition, the case of a height-adjustable envelope.
• the processing of the destination surface must extend over the entire external face of the base 261 or, more precisely, between extreme limits which correspond on the one hand to the case where, for lack of sufficient surface to guarantee the effective closure of the container, the length L l of the free end of the panel 241 would be too small, and on the other hand in case the wrapped article is very thin, in which case the height H is practically zero and the free end of the panel 241 covers practically the entire surface of said external face of base 261.
• the reference 30 shows the trace of the treatment of this external face and it is understood that the tool which left this trace had a useful width slightly less than that of the base 261.
• a self-adhesive label B bearing the name and address of the recipient is optionally attached to the container, either on top or on the free end of the panel 241, or even on the external face of the base 261 along the length L 1
• the self-adhesive labels are not requested to peel off and they adhere perfectly to the corrugated cardboard treated or not, so that they do not require the presence of traces of treatment 230 but it is understood that, quite obviously, this treatment if is not necessary, cannot have any drawback since in all cases it improves the adhesion capacity.
• the treatment can consist of a physical operation such as scraping, as will be described in detail later.
• This operation has the effect of making the destination surface more capable of retaining the adhesive 2, in order to prevent the accidental opening of the container which has been explained with reference to FIGS. 6 to 9, so that the container closed of figure 20 can be shipped in any safety without any other precaution and can even receive heavier items than those usually accepted with this type of container.
• the application surface (internal surface) must be treated in addition to or in place of the destination surface (external surface).
• FIG. 21 shows the blank of FIG. 17 before application of the long-acting adhesive 2 and after a treatment such as a scraping which leaves traces 230 on the internal face. from panel 241.
• corrugated cardboard panels 5 are circulated in the direction of the arrow FI so that they pass successively over several sets which are in the order of passage:
• an assembly 600 comprising one or more rolls of protective raban 20 as well as the means of positioning above the long-acting adhesive 2; • an assembly 700 intended to crush at least slightly, through the protective tape 20, the adhesive 2 previously deposited.
• the assembly 400 comprises a mechanical member for scraping at least part of the upper face of the panels 5.
• This mechanical member is here a brush 401 driven in rotation from a motor 402 by a transmission 403 of any suitable type to this function.
• the direction of rotation of the brush 401 must be the counterclockwise direction, arrow F 10, when the direction of movement of the panels 5 is that of the arrow FI.
• this direction of rotation depends on several parameters: surface condition and speed of drive of the panels 5, power of the drive means, etc.
• it may then be necessary to choose the anticlockwise direction in which case it is necessary to adopt a speed of rotation such that the tangential speed in the zone of contact with the panels 5 is different from the speed of scrolling of these, otherwise the desired erosion effect would not occur.
• the brush 401 causes the surface removal of fine particles which it is preferable to capture and eliminate, but what turns out to be non-essential, what is obtained here.
• the panels 5 therefore have a part of their surface suitably treated to receive the adhesive 2.
• a tank or “melter” 1 which is provided with heating means (not shown) suitable for melting the adhesive 2 at a temperature at which it is malleable, that is to say in a fluid state close to the liquid state, and which is provided with one or more conduits 3 leading to one or more orifices 4 which open immediately above the panels 5.
• the conduit 3 can be insulated by a jacket 501 making it possible to maintain the temperature of the adhesive 2 to the immediate vicinity of the application surface on the panels 5.
• the orifices 4 can be of different types depending on whether a single bead of adhesive 2 or more has to be deposited on the panels 5, depending on whether adhesive 2 is to be removed é, in particular by simple gravity, or extended. Each orifice 4 can therefore be formed by a simple nozzle ( Figures 22 and 23) or by a "lip nozzle" (not shown).
• the adhesive 2 arrives hot on the surface of application of the panels 5 and cools rapidly to result in a pasty state in which it is still malleable and by which it adheres sufficiently to the panels 5 so that the latter entrain it in their displacement according to arrow FI, in the form of one or more cords.
• the piston of the jack 702 is mounted vertically movable according to the arrow Fi l in order to allow the position in space of the lower generator of the roller 21 to be adjusted as precisely as possible, since it is good for the bead of adhesive 2 to be not crushed inconsiderately but calender according to a precise calibrated thickness, so that its upper face and the protective flap 20 which is lying on it lie in a plane parallel to the plane P and at a height h of the latter sufficient to fill the hollows appearing on the surface because of the corrugated cardboard grooves and, simultaneously to cover the alternating reliefs with the hollows (see Figures 15 and 16).
• the adhesive 2 can be applied less attentively, but nevertheless at the risk of a poor application of the adhesive 2 which tends to deposit more on the reliefs. than in the recesses, which greatly reduces the surface covered with adhesive and degrades the adhesion capacity accordingly.
• FIGS. 24 to 35 diagrammatically according to four variants of the method, the operations of the machine 300, considered respectively after the assembly 500, with the assembly 600 and after the assembly 700 are shown.
• FIGS. 24 to 26 correspond to the variant according to which an orifice 4 delivers the adhesive 2 from top to bottom in a vertical flow 801 which is deposited on the panel 5 and extends horizontally according to a single bead 802. It can be seen in FIG. 24 that the bead 802 considered immediately after its arrival on the panel 5 still has very substantially the same section as that of the casting 801, that is to say here a circular section.
• the bead of adhesive 802 is slightly sagged and its section is flattened with a lower flat applied to the panel 5 and a flat upper 803 on which the protective flap 20 is posed according to a contact surface markedly greater than it would have been with the only upper generator of a cord 802 with circular section.
• the protective flap 20 thus adheres to the cord 802 in a sufficiently strong manner that it is driven in the movement of the panel 5 and pulled in the unwinding of the reel 22, above all that it is also pulled by the roller 21.
• the roller 21 is at a precise height, less than the total thickness of the adhesive bead 802 already collapsed and the protective tape 20, of so that the assembly is pressed and the cord 802 becomes a flat layer 804 of exactly calibrated thickness and the same width as the raban 20 (FIG. 26).
• the adhesive 2 is distributed in several (here four) flows 805 forming as many separate beads 806.
• the orifices of the application device have not been shown because the production of this device is in itself within the reach of a person skilled in the art, knowing that these orifices are located at the end application heads, the outlet of which must be oriented from bottom to top.
• the adhesive 2 it must have a viscosity adapted to this mode of application by projection and be set in motion at a pressure and at a speed correctly coordinated for immediate fixing to the underside of the panels 5. This variant is possible due to the low specific mass of each cord 807 and must be adopted when the conditions of manufacture of the objects so require. This is the case, in particular, when the adhesive 2 is applied to a corrugator, according to the diagram in FIG. 40.
• the machine 300 of FIG. 22 can be of different types, either that it is a specific machine the sole purpose of which is to apply adhesive 2 and a protective flap 20 on panels of corrugated cardboard cut into rectangles for later cutting of blanks, or on pre-cut blanks or blanks, either as a machine with other functions: folder-gluer for cut blanks, press cutting machine, printing machine, assembly sheet application machine known in the United States under the generic name of "typing", etc.
• the assemblies 400, 500, 600 and possibly 700 can be considered as sub-assemblies grouped into a whole, itself forming a large complementary assembly of an existing machine or specially designed for this purpose.
• the method according to the invention therefore has different specific applications, each corresponding to precise functions of a sequential production line with taking up of the products in stages, or on the contrary corresponding to a complex unit incorporating the device of the invention described opposite. of Figure 22 in addition to other functions.
• the only operation common to all the machines is the displacement of the support (the panels 5 of figure 22) having to receive the adhesive 2 and the protective tape 20, from where the necessary presence of a conveyor of the kind 301 of the machine 300, as well as a materialization of the reference plane P.
• FIG. 36 a specific machine 900 has been represented diagrammatically, the sole purpose of which is to apply adhesive 2 and a protective tape 20 to panels 5 cut into rectangles and intended to be then cut into blanks in a shape and dimensions corresponding to the objects to be obtained. Two examples of such sketches are shown in Figures 10 and 16.
• the machine 900 comprises a frame 901 associated with two conveyors 301 each having an endless belt passing over drive pulleys 902, deflection pulleys 903 and tension pulleys 904, in order to obtain an upper strand 905 which extends in the same plane situated opposite the lower strand of endless belts 906, the upper strand 905 and the lower strand of the belts 906 being arranged to drive together, by energetic friction, the panels 5 inserted between them.
• the conveyors 301 are set in motion in the direction of the arrow FI for the upper strand 905, from a motor 907 and from a transmission 908 with the interposition of a clutch 909.
• the feeder 910 Upstream of the frame 901, considering the direction of the arrow FI, there is a device 910 for the reception of a stock of stacked panels 5 and the distribution of these panels 5 one by one, this device being known by the name of "Feeder".
• the feeder 910 includes an inclined support 911, an endless belt conveyor 912 and a distribution regulator 913.
• a device 920 for receiving and superposing the panels 5 one on the other after they have each received the long-acting adhesive 2 and the protective tape 20 This device is known as a "stacker" because it receives the panels 5 one by one and stacks them on top of each other.
• An endless belt conveyor 921 has a lower end 922 located in the immediate vicinity of the downstream end of the upper strand 905 and below the level thereof so that the panels 5 automatically pass from strand 905 to upper strand 923 of the conveyor 921 which drives them according to arrow F 12.
• the conveyor 921 is inclined and its upper end 924 is in the immediate vicinity of a support 925 mounted movable relative to fixed columns 926. As the stack of panels 5 increases in height according to a given pitch and which corresponds to an integer number of panels 5, the support 925 is lowered so that the level at which the panels 5 are deposited by the conveyor 921 remains substantially constant.
• the mechanical member of the assembly 400 is a brush driven in rotation anticlockwise and which by scraping removes on the surface particles extracted from a more or less thick layer of the upper face of each panel 5, and which leaves a trace 230 which can be observed more or less well, with the naked eye or by means of a magnifying optical instrument.
• FIG. 38 another example of assembly 400 having an active member has been schematically represented. which does not remove material from the panels 5 but deposits on their upper face a corrective product which leaves a trace 230 more or less apparent depending on its composition.
• the product may have a chemical composition allowing it to act on the material of the panels 5, in particular by reacting with the kaolin which covers the upper face, in order to create an application surface conducive to the energetic attachment of the adhesive 2 deposited by the assembly 500.
• Such a product can, for example, be a water-based adhesive.
• the product is stored in a tank (not shown) from which a conduit 408 arrives provided with a lip nozzle 409 which distributes the product horizontally and in a thin layer.
• FIG 39 there is shown schematically an assembly 400 which makes it possible to apply electrical treatment to the panels 5.
• This assembly 400 comprises a high frequency current generator 410 comprising two links 411 and 412 for two electrodes 413 and 414 positioned on either side of the path of the panels 5.
• the generator 410 When the generator 410 is operating, it causes the formation of a strong electric field through which the panels 5 flowing along the arrow FI pass.
• the electrodes 413 and 414 being symmetrical, the micro perforations are located on both sides of the panels 5, which can be a great advantage in preparing the application surface on any one of these faces, when such an assembly 400 is made upstream of a machine which applies the adhesive 2 since it is not necessary to locate the face which will have to have the application surface. It is recalled, in fact, that if the operations of the sets 500 and 600 are necessarily grouped and synchronized, it is not the same for the operations of the set 400 which can intervene in isolation and very upstream of the application of adhesive in the overall manufacturing process.
• FIG. 40 we see the block diagram of a corrugator, that is to say of a machine which produces a continuous strip of corrugated cardboard from sheets of paper in reels.
• a corrugator that is to say of a machine which produces a continuous strip of corrugated cardboard from sheets of paper in reels.
• the corrugator 1000 of FIG. 40 comprises a frame (not shown) associated with an endless belt conveyor 301 ensuring the transfer according to the arrow FI of a sheet of indefinite length coming from the assembly by gluing of three sheets of paper 1001, 1002 and 1003 stored in long reels 1004, 1005 and 1006.
• the sheet of paper 1001 passes between two fluting rollers 1007 and 1008 which create transverse grooves producing a corrugated strip 1009.
• the sheets of paper 1002 and 1003 pass over guide rollers 1010 and 1011 so that they land on either side of the fluted sheet 1009 to which they are fixed by gluing to form a strip of corrugated cardboard 1012 of indefinite length and can we say endless because as soon as a reel 1004 and / or 1005 and / or 1006 is empty, it is replaced by another and the ends of the end of the sheet and of the start of the new one are stuck one to the other to allow continuous production, without stopping the machine.
• corrugators are well known in themselves, those skilled in the art know that the sheets of paper before being glued must be conditioned or preconditioned, in particular humidified and heated with steam and that the corrugator must include tensioning means, of guidance, drying, cooling and speed regulation coordinated in a complex whole.
• the corrugator produces a strip 1012 of large width, of the order of two and a half meters, and the products best suited to the presence of long-acting adhesive 2 are cut from clearly narrower plates.
• the assembly 400 is composed of several organs 401, several mouths 405 and several conduits 406 formed in sub-assemblies whose position is adjustable through the corrugator 1000, in order to position as many sub-assemblies as 'It is necessary at a given distance from the edges of the strip 1012, to apply to this strip 1012 the desired number of lines of adhesive 2: cords 802 or 806 and tape 20 on previously created application surfaces.
• adhesive 2 and its protective tape 20 can deposit adhesive 2 and its protective tape 20 by a continuous corrugator if the products which will come from the strip 1012 must be provided of adhesive over their entire width or length, from edge to edge, in which case the bead of adhesive 2 and the protective tape 20 are continuous.
• the strip 1012 then arrives at the machine outlet where there is a cutting assembly of a type known per se.
• This assembly ensures the splitting of the strip 1012 both transversely, as indicated by a blade 1013 mounted movable perpendicularly to the plane of the strip 1012 according to the arrow FI 3, and longitudinally by means of cutting discs mounted rotary relative to supports whose the position is adjustable transversely according to the widths of width which are imposed by the production program, which takes into account the desired formats for the products to be produced from the plates obtained at the outlet of the corrugator 1000.
• These means, their operation and their control are not part of the present invention and are known to those skilled in the art.
• This distance should theoretically be exactly equal to the thickness of the flap below. According to the invention, this distance is established as being greater than normal, so that the top flap can be inclined slightly towards the bottom flap, and not strictly parallel and even less inclined in the opposite direction.
• these lines are formed by perforations which pass right through the constituent material of the flaps and which are separated by solid parts.
• the creasing tools are therefore formed by alternating delivery nets and cutting blades and there are more or less cutting blades depending on the nerve of the cardboard that you want to break and, in any case, weaken.
• the cutting blades can be simple punches which, then, must be more numerous than blades whose cutting wire can extend not on a single point but on a short length.
• the long-acting adhesive 2 is intended to be used more or less long after its application on the application surface, it is active from its application and remains there for a long time, so that it must be covered with the protective flap 20, easily removed at the time of the use of the adhesive 2 and which neutralizes the latter to avoid any accidental sticking, in particular when the support on which the adhesive 2 is applied must undergo mechanical manipulations or treatments in machines, which is the case of cardboard panels, particularly corrugated, for obtaining containers: printing, cutting, folding, mounting, etc. It is in fact understood that a cardboard panel introduced into a machine while the adhesive 2 which it carries is active and not insulated by the protective flap 20, causes costly disruptions in time to restore the working condition of the machine and in production losses.
• the machine parts are smeared with adhesive 2, the cardboard panel is suddenly removed from its normal path, fragments torn from the panel are introduced into places that are difficult to access and, moreover, the machine must be stopped immediately, clean it and restart it after a more or less long repair time depending on the characteristics of the machine, not to mention the material losses due to this sudden stop.
• the precautions currently taken essentially consist in exercising particularly vigilant surveillance of the protective flap distributors in order to prevent any interruption in its installation.
• a method is also adopted which consists in applying the adhesive 2 and its protective tape 20 to a specific machine producing panels 5 carrying this adhesive 2 and its protective tape 20 which are then treated on a folder gluer.
• the latter which alone carries out a complex industrial process, remains sheltered from any incident of application of the adhesive 2 since it only receives cardboard panels 5 or blanks whose adhesive 2 is already correctly fitted with its protective tape 20. If such an incident occurs, the consequences are slight since the repair of the machine is limited to removing by hand one or a few panels 5, to restoring the application of adhesive 2 and the installation of the protective tape 20.
• the panels 5 to be treated remain in their place at the entrance to the machine, inert since they do not undergo any treatment, unlike the application of treatments at the entry of a corrugator for example.
• the present invention makes it possible to apply adhesive 2 to any support, on a pre-existing machine or on a specially designed machine, whatever the complexity of the industrial process implemented and whatever the severity of a related incident. on the application of a long-acting adhesive 2 and its protective tape 20.
• a support which is here corrugated cardboard, and which can therefore be a corrugator, folder-gluer or specific machine.
• a sheet of corrugated cardboard already prepared, continuous or cut into panels passes along the arrow FI and first passes under a device 500 for applying adhesive 2 comprising a reservoir 1, a conduit 3 and an orifice dispensing device 4, and then passes under a device 600 for applying a protective tape 20 comprising a storage reel 22 rotating according to arrow F 14 when the protective tape 20 is unwinding normally, a removal mechanism 601 and a pressure roller 21 from which the tape 20 is applied firmly against the adhesive 2 with or without projecting over the part of the support not provided with adhesive, laterally and / or at the ends of the bead of adhesive 2.
• This is achieved so the application on the corrugated cardboard support of a bead of long-acting adhesive 2 and a protective tape 20 which completely isolates the adhesive 2 and prevents it from adhering to anything.
• the support thus furnished continues its course in the machine, during which it comes into contact with different mechanical organs: cylinders, guides, feelers, cutting devices, stackers, pressers etc.
• Conductors 1043, 1046 and 1049 lead to a controller 1050 which can be more or less complex, including a computer and management software, connected to an alarm 1051 and comprising a link 1052 when the controller 1050 must not only trigger the alarm 1051 but must also automatically control the entry into action of a backup device when an incident occurs.
• a controller 1050 which can be more or less complex, including a computer and management software, connected to an alarm 1051 and comprising a link 1052 when the controller 1050 must not only trigger the alarm 1051 but must also automatically control the entry into action of a backup device when an incident occurs.
• the adhesive 2 already applied is torn off, the verb "tear off” being deliberately adopted to mean that the removal of the adhesive 2 must be total, energetic and immediate, the slightest bit of adhesive 2 not covered with protective tape 20 which can have extremely serious consequences.
• the upper part of the support is removed, that is to say the sheet of paper 32 originally glued to the corrugated sheet of paper 34, itself glued to a lower sheet of paper 33. It would be satisfactory to strictly remove only the adhesive 2 but since the smallest fraction of adhesive 2 is still dangerous, it is illusory with the means currently available to hope to keep the support intact while removing all of the adhesive 2.
• FIG. 43 shows a backup device 1060, the essential element of which is a share 1061 pivotally mounted, as indicated by the arrow F 15, along a horizontal axis 1062 between an active position in which it cuts the corrugated cardboard support and a standby position shown in dotted lines in which it is out of the way of said support, which is the normal operating situation, implying the correct installation of the protective tape 20.
• the plowshare 1061 can be fixed or mobile, and formed for example by a rotary disc whose periphery is sharp to have a great cutting efficiency and being arranged in inclined plane, it serves as a ramp for the assembly 2- 32 - 34b which is directed to a conduit 1063 associated with a suction mechanism (not shown) which leads to a receptacle 1064 used for temporary storage of the waste before its elimination.
• the coulter 1061 must be provided with a protection making it possible to avoid a personal accident which would be due to its dangerous character.
• the controller 1050 sets the alarm 1051 in action to urgently warn the personnel monitoring the machine.
• the backup device 1060 is placed far enough from the set 600 of application of the protective flap 20 and / or that the speed of travel of the support gives the personnel the time it takes to start the device. 1060 backup. However, it is more advantageous to make this automatic start-up, in which case the device 1060 must be equipped accordingly, which is within the reach of those skilled in the art and which is therefore not shown or described here.
• the trigger which can be a circuit breaker, a solenoid valve, etc., is actuated by the controller 1050 and the electrical link 1052.
• the backup device 1060 comprises one or more rotary disks 1065 with cutting periphery and mounted on at least one lever 1066 pivotally mounted, as indicated by the arrow F 16, along a horizontal axis 1067, between an active position where the lever 1066 is lowered and where the disc (s) 1065 are driven in rotation according to arrow F17 crossing the entire thickness of the support, and a standby position shown in dotted lines where the lowest point of the discs 1065 is located clearly at above the support, the adhesive 2 and the protective tape 20.
• the backup device 1060 is started by lowering the lever 1066 and by rotating the disks 1065 as soon as the controller 1050 receives the signal from the cells photoelectric 1047 and 1048.
• a single disc 1065 is sufficient, located plumb with an imaginary line of the support, parallel to this longitudinal edge and located below him, to cut a margin of the support clearly wider than the bead of adhesive 2, in order to withdraw with certainty the entire width of this bead 2.
• the machine is provided with a backup device 1070 which is constituted in the same way as a device 600 for application protective tape 20.
• the controller 1050 sets the alarm 1051 in action and the personnel, or an automatic mechanism controlled by the controller 1050 by the line 52, sets in motion the device 1070 which replaces the faulty device 600.
• the backup device 1070 is designed to deliver a protective tape 1071, and comprises a coil 1072, a removal mechanism 1073 and a pressure roller 1074.
• an automatic alert or synchronization mechanism is then required to ensure the entry into operation of a 600 or 1070 assembly as soon as the other, 1070 or 600 becomes unavailable for a normal cause or for an operational incident.
• the two devices 600 and 1070 being necessarily offset longitudinally, the adhesive 2 is not strictly in the same physical state at the two places where it can receive the protective flap 20, so it is necessary to pay attention to this state of affairs, in particular by precisely adjusting the viscosity and the dryness of the adhesive 2, the application temperature, the speed of travel of the support and other parameters likely to affect the correct application of the protective flap 20-1071 on the adhesive 2.
• the covering flap may be of a color distinctly different from that of the normal protective tape.
• the devices 600 and 1070 are exactly aligned and positioned longitudinally so that the tape 1071 is applied in time so that no part of adhesive 2, however small, is not deprived of protective tape 20, if necessary by providing an overlap from the end of the ribbon 20 to the beginning of the ribbon 1071, which is shown in the area 1075.
• the material element which is placed on the support in the event of an incident in the application of the protective flap 20 is a chemical.
• the long-acting adhesives that currently exist are inactive or weakly active on silicones, which is why the protective flap 20 is made of paper of which at least one face is silicone, or of synthetic material.
• the raban 20 sticks a little to the adhesive 2, especially when it is pressed by the roller 21 while the adhesive 2 is still hot enough, and can be easily removed when a user later wants to use it.
• adhesive 2 in particular for keeping it upright and / or for closing a container, since this withdrawal practically does not offer resistance while the adhesive 2 is fully active.
• the activation of the alarm 1051 warns the surveillance personnel who manually use a portable canister 1081 containing a silicone product under pressure 1082 and provided with a valve 1083, so that by action on the valve 1083, product 1082 is sprayed onto the adhesive 2 bare, by the staff themselves, who visually check the end of the correctly applied protective raban and the new arrival of protective raban after it has been terminated at the incident, this ocular observation guaranteeing that all the adhesive 2 inadvertently left exposed has indeed been neutralized by a layer of silicone 1082.
• the part of the support which carries adhesive 2 covered with pulverized silicone 1082 is unusable since it is no longer possible to remove the silicone product 1082 and to use adhesive 2 but this same "damaged" part of the support can continue its journey through assembly M without causing the slightest damage, which allows the machine to run without loss of production.
• pressurized “bombs” 1081 does not require any automatic control from the controller 1050 and that the alarm 1051 must be sufficient to alert the personnel specially trained for this intervention.
• the other variant consists in using a tank 1084 of greater capacity than a simple pressure bomb 1081, one or more conduits 1085 and one or more fixed ramps 1086 arranged transversely to the support over a width corresponding to the zone or zones to be received. adhesive 2.
• the spraying of product 1082 is caused in synchronism with the occurrence of the absence of protective tape 20, either manually after activation of the alarm 1051, or automatically from the controller 1050 and the link 1052 which, in particular, may cause the operation of solenoid valves (not shown). It emerges from the above description that the process according to the invention can be embodied in different although comparable devices, the important thing being to neutralize the adhesive 2 already applied to the support or which continues to arrive, to allow the machines to operate as continuously as possible despite an incident of major importance.
• the precision necessary for the application of the long-acting adhesive 2 in order to subsequently obtain an effective fixing of the application surface and of the destination surface, must be considered not only in distance from the support, when determining a plane. of reference, but also in speed of application of the protective tape 20 relative to the support, since there is always a relative movement between these two elements. This is why provision can be made to drive the pressure roller 21 by a motor whose speed is synchronized with that of the support, so that the protective tape 20 is positively driven, at the desired speed.
• the pressure roller 21 is kinematically connected to motor means, shown diagrammatically in FIGS. 47 to 54 by an electric motor 21a, the operation of which is synchronized with the movement of the panels 5 to which the adhesive 2 and the protective flap must be applied 20, so that the operation of the roller 21 is linked on the one hand to the actual presence or absence of the panel 5 directly above the roller 21 and on the other hand to the speed at which the panels 5 are driven.
• roller 21 drives the protective flap without fail and precisely at the start of each segment and that this drive is interrupted between two successive segments.
• the roller 21 has a central part 21 b with a diameter less than that of two lateral parts 21 c and 21 d, the half-difference of the diameters being slightly less than the thickness of the protective tape 20.
• the two lateral parts 21ç_ and 21d are intended to be in contact with the panels 5, while being supported on their upper face, which leaves a central space between this upper face and the central part 21b, the height of which is a little less than the thickness of the protective flap, so that the free end of the latter engaged in this space is driven by friction on the one hand against the part central 2 lb and against the upper face of the panel 5.
• These dimensions are very small because, in practice, the central part 2 lb has a diameter of 25 millimeters and the lateral parts 21c and 21d have a diameter of 25.02 millimeters, a difference in diameter of 2 tenths of a millimeter.
• FIGS. 47 and 48 the roller 21 is shown in the situation where there is no panel 5 present and it is observed that there is a space El between the lower generatrix of the lateral parts 21c and 21d and the upper face of the conveyor 301 on which the panels 5 must be located to be driven.
• This situation corresponds to the case where an interval between two successive panels 5 is plumb with the roller 21, so that the motor 21 can be stopped.
• the roller 21 since the roller 21 is not in contact with any element, it can continue to be driven by the motor 21a, that is to say that it then rotates in a vacuum.
• FIGS. 49 and 50 it can be seen that a panel 5 has arrived, driven by the conveyor 301 and that the space El is entirely filled by the panel 5, so that the treads 21 ç and 21 d are in contact with the panel 5 and the speed of rotation of the roller 21 must be established so that its tangential speed is exactly equal to the linear speed of the panels 5, in which case their relative speed is zero.
• the free end of the protective flap 20 was engaged by the rear of the roller 21, in line with the central part 21b, and like the difference in diameters between the treads 21c-21d and the central part 21b is only 2/10 th of a millimeter, the space in which the protective flap 20 is introduced is l / 10 th of a millimeter, which is slightly less than the thickness of said protective tape 20, for example 15/10 th .
• FIG. 51 the long-acting adhesive 2 shown from the application head 6 through the orifice 4 but before reaching the vertical alignment of the roller 21, which moreover does not correspond to any real situation, but is useful for the decomposition of the various movements.
• FIGS. 53 and 54 correspond to reality, namely the application of the long-acting adhesive 2 and the protective tape 20 on a panel 5.
• the panel 5 is driven by the conveyor 301, the adhesive 2 applied to the panel 5 obviously follows it, the protective tape 20 is driven both by the panel 5 and by the roller 21. But, as explained above, the panel 5 - adhesive 2 - protective tape 20 assembly must be laminated, so that the bead of relatively thick adhesive 2 must be spread laterally, at the less partially.
• the space of 1 / l 0 th of a millimeter is voluntarily insufficient to let pass the bead of adhesive 2 and the protective tape 20, but the roller 21 is left a small latitude of movement in height according to the amplitude x visible in FIGS. 53 and 54, that is to say that the roller 21 and its axis are mounted vertically movable, as already seen in FIGS. 1 and 22.
• FIG. 56 it is shown that the lateral parts forming treads 2 le and 21 d of the roller 21 can be provided with reliefs, in particular a knurling, in order to increase their drive coefficient with the upper face of the panels 5.
• roller 21 can be provided with reliefs both in its central part 21b and in its lateral parts 21c and 21d.
• the reliefs can be of different types, in particular spikes, when the roller 21 must cooperate with the protective raban 20 and / or with the support proper no longer only by rolling and friction but by penetration into the material constituting the protective raban 20 or the support.
• FIG. 57 shows a variant of the method of the invention according to which the protective flap 20 is wider than the bead of adhesive 2 after lamination, which allows easier removal of the protective flap when it is desired to expose the adhesive with prolonged effect when fixing application and destination surfaces.
• FIG. 58 illustrates a particular embodiment of the invention according to which the protective flap 20 is significantly wider than the bead of adhesive 2 after lamination, so that the lateral margins of this protective tape 20 which extend beyond the edges of the bead of adhesive 2 can be inserted between the support and the treads 21c and 21d, which are then advantageously knurled to increase the drive coefficient.
• FIG 59 shows the drive of the roller 21 by a transmission belt forming part of a more complex application mechanism 600 which will now be described with reference to Figures 60 to 62.
• the pressure roller 21 can be made of metal (in particular steel) but can also be made of elastomer, in particular of the type having a structure comprising a peripheral tread and a solid central part, in one piece with substantially radial tongues, generally curved.
• the diameter of the roller 21 can be more or less important, the dimensions given here for information only, having no limiting character.
• the real problem which must be solved is that of the faultless application of the protective flap 20, no tolerance being possible for a sliding, an offset or an absence of the protective flap relative to the adhesive 2 already deposited.
• this adhesive 2 is applied to the support and there is no possibility of displacement of said adhesive 2 relative to the support. Consequently, the protection tape 20 can be piloted by reference to the support rather than by reference to the adhesive, since it is easier and safer to refer to the support which is a solid material element whose position in the space is easily determined or determinable, even individually panel 5 by panel 5.
• the invention provides a solution a little different from that described above which, remember, consists in synchronizing the application of the protective tape 20 with the movement of the panels 5.
• This other solution consists in making integral with one another the support on the one hand and the protective tape 20 on the other.
• an immediate effect glue which is deposited in small quantity (for example a single point) on the support, in a small area located near the place where the protective tape 20 will dock, c that is, near its free end. This small area is located near the upstream transverse edge of each panel 5.
• the glue with immediate effect deposited on the support can be replaced by a product having affinities with the adhesive 2 already deposited, in order to vigorously fix the protective tape 20 to the adhesive, despite the weak voluntary adhesion of the silicone face.
• the machine must be provided with a reservoir and a conduit leading to an outlet orifice constituting a device for delivering (not shown) product, adhesive with immediate effect or other, the practical realization is within the reach of the skilled person.
• the outlet nozzle of the product delivery device is located between these two posts.
• Another solution consists in using the property of the protective flap 20 of having a face very little sensitive to the adhesive 2, in particular because this face is coated with silicone, and an opposite face which is, on the contrary, sensitive to the adhesive 2, in particular because it has no silicone. This structure is found in particular with protective flaps made of silicone paper on one side.
• the protective tape 20 is folded transversely near its free end in order to fold over itself a small fraction of this protective raban 20, so that close to its free end, and only there, the protective tape 20 present in adhesive 2 already deposited its sensitive face to its retention, whereby one obtains the positive attachment of the protective tape 20 to the adhesive already deposited on the support.
• the subjugation of the protective tape 20 to the support, directly or through the adhesive 2 has the advantage of ensuring the anchoring of this protective tape 20 making it possible to tow it at the running speed of the panels 5 , despite the significant effort that must be developed to extract it turn by turn from the coil 22, even in rapid sequential operation, subject to frequent jolts.
• the motor 21a can be used, but it is necessary to have a relatively complex and delicate control assembly which is a source of failure and which requires a minimum monitoring and maintenance that can be avoided by the process described below.
• the application mechanism 600 comprises a movable assembly, the basic element of which is a plate 2000 pivotally mounted parallel to its plane and connected to the pneumatic cylinder 80 intended to rotate it in two opposite directions, for a reason which will be explained below. .
• a motor roller 2001 intended to come into contact with the successive panels 5 and to maintain this contact over the entire length of each panel 5.
• the linear movement of the panels 5 by the machine conveyor (not visible in figures 60 to 62) has the effect of rotating the motor roller 2001.
• a movement transmission member here a belt 2002 which can be notched, is engaged in a groove of the roller - motor 2001 and in a groove of a return roller 2003 which, simultaneously constitutes the pivot axis of the plate 2000
• a second belt 2006 engaged in another groove in the same idler roller 2003 is engaged with a groove in the pressure roller 21 (see also Figure 59), so that the rotation of the motor roller 2001 results in the rotation in the same direction of the pressure roller 21.
• the free strand of the protective flap 20 passes over tension and return rollers 2007 and is engaged under the central part 21b of the roller 21.
• FIG. 60 a panel 5 is present and the roller-motor 2001 is in rotation, the jack 80 has been supplied with compressed air to cause the extension of its rod which has made the plate 2000 pivot at an angle whose apex is in the axis of the idler roller 2003, as indicated by arrow F 18.
• the pressure roller 21 is not only rotating too, but it is further lowered until it is in contact with the panel 5 against which it exerts pressure through the protective tape 20 and the adhesive bead 2, as has been described in detail opposite. Figures 47 to 54.
• FIG. 61 it can be seen that below the pressure roller 21, there is an interval between two successive panels 5, and the supply to the jack 80 has been reversed in order to rotate the plate 2000 in the opposite direction, at the same angle, as indicated by arrow F 19, in the direction of lifting of the pressure roller 21.
• FIG. 62 which also shows that due to the alignments necessary for the belts 2002 and 2006, the motor roller 2001 has a barrel 2008 of diameter smaller than that of the active part proper in contact with the panels 5, in order to be clearly above the upper level of the adhesive bead 2.
• This mechanism 600 is extremely efficient and very simple since the speed of the engaging rollers is always strictly equal to the linear speed of the panels 5, without any possible variation because they all have exactly the same diameter.
• the device that has just been described is an example of motorization, which differs from the use of the electric motor 21a but which results in the same result which is to set in motion the application roller 21.
• FIG. 63 an embodiment has been shown making it possible to eliminate the tensile strength of the protective flap 20, due to the inertia of the coil 22.
• This arrangement is particularly important for the simultaneous sequential application of adhesive.
• long-acting 2 and protective tape 20 that is to say on panels 5 separated by intervals which make it necessary to trigger the application and to stop it alternately at a rate which is all the more rapid as the machine goes fast to produce more.
• the application is continuous on a strip of indefinite length, the problem of the traction of the protective flap 20 is less difficult because once started at the start of the cycle by an effective fixing of the end of the protective tape 20, it unwinds continuously and the problem of this kind of installation is only that of changing an empty coil by a full coil.
• Figure 63 we create an intermediate stock of unwound protective raban, which comes in long free loops, that is to say that we have dissociated the unwinding operation and the operation application.
• the free strand of the protective tape 20 is engaged between two rollers associated in a pair 2010, at least one of which is kinematically connected to a motor 2011, in order to cause the protective tape 20 to be extracted turn by turn from the coil 22.
• the free end of the protective tape 20 is engaged in the entry 2012 of a rectangular receptacle 2013 provided, opposite the entry 2012, with an exit 2014 by which the free end of the protective tape 20 is extracted from the receptacle 2013, after which it is led by tension and return rollers 2007 to the application mechanism 600 which has been described above.
• the protective flap 20 accumulates in bulk, that is to say without tight winding, in large stacked folds, alternately left and right, free of any catch so as not to oppose any tensile strength of the protective flap 20 outside the receptacle 2013 by the outlet 2014.
• This coil 22 can also be associated with a rotation motor 2015 which is synchronized with the motor 2011 so that they operate in a coordinated manner, in particular ensuring the tension of the protective tape 20 between the coil 22 and the input 2012 .
• Another solution consists in providing the coil 22 with a braking mechanism 2016 acting on its axis of rotation, a mechanism which can be, for example, an electromagnetic brake which operates intermittently to brake the coil 22 when the 2010 pair of rollers is stopped and to release the coil 22 when the 2011 engine is started to drive the 2010 pair of rollers.
• a braking mechanism 2016 acting on its axis of rotation, a mechanism which can be, for example, an electromagnetic brake which operates intermittently to brake the coil 22 when the 2010 pair of rollers is stopped and to release the coil 22 when the 2011 engine is started to drive the 2010 pair of rollers.
• this member is a pilot roller 2017 which is positioned in such a way that the protective tape 20 stretched between the coil 22 and the inlet 2012 is necessarily in contact with it.
• This pilot roller 2017 is associated with a control mechanism (not shown) causing either the activation of the braking mechanism 2016, or the starting of the engine 2011, in order to catch up with the slack of the protective tape 20 indicated in dotted lines in Figure 63.
• the slack in the protective tape 20 has the effect of breaking the contact between the protective flap 20 and the pilot roller 2017, and this event is detected: • either by noting that the pilot roller 2017 is no longer rotated while, simultaneously, the coil 20 is released and the pair of rollers 2010 is stopped,
• the receptacle 2013 has six faces, two large and four small, these having a width such that the two large faces are spaced from each other a distance slightly greater than the width of the protective tape 20, so that it can stay in the receptacle 2013 without significant friction against its walls.
• the machine operator can judge visually whether the receptacle 2013 indeed contains a sufficient length of protective flap 20, the walls of this receptacle 2013, and in particular at least one of its two large faces, are transparent.
• the detector 2023 controls the action of the pair of rollers 2010 in order to introduce this length of missing protective flap and commands the stopping of this same pair 2010 as soon as the receptacle 2013 has regained its normal weight, picked up by the detector 2023. This operation ensures continuity of supply of protective tape 20 and guarantees that the correct length of this protective raban 20 is indeed present in the receptacle 2013.
• the inertia is eliminated by de-energizing the protective tape 20 at the outlet of the coil 22.
• the method consists in cutting the free end of the protective flap 20, which eliminates any direct connection between the traction member (the roller 21) and the coil 22.
• This assembly 2100 comprises a base 2101 on which four rollers are grouped in rotation in two pairs 2102 and 2103 and one of each pair of which is kinematically connected to a motor 2104 - 2105.
• the two pairs of rollers 2102 and 2103 are arranged on either side of a central cutting mechanism 2106, composed of a cutting cylinder 2107 kinematically connected to a motor 2108 and a counter-cylinder 2109.
• Fixed guides 2110 and 2111 are provided on either side of the central mechanism 2106, between it and the two paries of rollers 2102 and 2103, and a fixed guide 2112 is provided between the pair of rollers 2103 and the assembly of application of which the roller 21 is a part.
• the free end of the protective tape 20 is engaged between the two rollers of the pair 2102, then in the fixed guide 2110, then between the cutting cylinder 2107 and the counter-cylinder 2109, then in the fixed guide 2111, then between the two rollers of the pair 2103, then in the fixed guide 2112 and finally under the central part 21b of the roller 21.
• the latter is advantageously provided with a 2015 rotation or 2016 braking mechanism, operating as explained with reference to FIG. 63, that is to say in synchronism with the traction members which are here the rollers of the pair 2102.
• the speed of rotation of the cutting cylinder 2107 is established in order to pass from the position which it immediately occupies after a cut to that which it must occupy just before a new cut.
• this cutting assembly 2100 is as follows: The protective tape 20 has been engaged as explained above. At a given moment, the first cut occurs by almost instantaneous rotation of the cutting cylinder 2107, which creates a segment which has two free ends and which extends downstream of the cutting mechanism 2106 and upstream of the removal assembly. , caught between the two rollers of the pair 2103 which ensure its movement until it is pinched by the roller 21, which operates as already described.
• the protective flap 20 when the protective flap 20 is applied to the moving panel 5, it is in the form of an already cut segment, which is no longer integral with the turns of the coil 22 and which having an insignificant weight, does not opposes no resistance to its establishment by the roller 21, and this all the more since this segment has a sufficient length to be still caught between the two rollers of the pair 2103 which contribute to its movement.
• the cutting cylinder 2107 is in action more or less often, this data being easily maintained for all the production of identical products. It is also easily adjustable as required.
• the minimum admissible length L2 of a segment is substantially equal to the distance D2 which separates the axes of the rollers of the pair 2103 and the axis of the roller 21 because a shorter segment would no longer be taken between the rollers of the pair 2103 and would not yet be pinched by the roller 21, so that it would be abandoned without the fixed guide 2112, and would cause jamming of the segments which follow it.
• the invention allows a very precise application of a long-acting adhesive, either pre-existing on a prefabricated product of the transfer flap type, or applied directly to a support immediately upstream of the application of a protective tape, even when the support is not perfectly flat and regular, so that this long-lasting adhesive can be used long after its application, with the same precision, despite random manual operations, thanks to the operations carried out in the factory, on a machine.
• the quality of the product obtained is accompanied by an additional advantage which is the high speed possible for industrial machines used, both continuously, of the kind of corrugators, as well as discontinuous (or sequential), of the kind of folder-gluers.

Landscapes

• Adhesive Tapes (AREA)
• Adhesive Tape Dispensing Devices (AREA)

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• 2002
  • 2002-02-20 FR FR0202136A patent/FR2820060B1/fr not_active Expired - Fee Related
• 2003
  • 2003-02-19 EP EP03744394A patent/EP1483058A2/de not_active Withdrawn
  • 2003-02-19 CA CA002476395A patent/CA2476395A1/fr not_active Abandoned
  • 2003-02-19 US US10/505,530 patent/US7409976B2/en not_active Expired - Lifetime
  • 2003-02-19 AU AU2003242806A patent/AU2003242806A1/en not_active Abandoned
  • 2003-02-19 WO PCT/FR2003/000551 patent/WO2003078078A2/fr not_active Application Discontinuation

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