Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
  • B27M—WORKING OF WOOD NOT PROVIDED FOR IN SUBCLASSES B27B - B27L; MANUFACTURE OF SPECIFIC WOODEN ARTICLES
  • B27M1/00—Working of wood not provided for in subclasses B27B - B27L, e.g. by stretching
  • B27M1/08—Working of wood not provided for in subclasses B27B - B27L, e.g. by stretching by multi-step processes

Definitions

• the present invention relates to a method of fa ⁇ brication of a box or box as well as the production line and the box or box obtained.
• Many devices are known for manufacturing packaging and more particularly boxes with a nestable lid.
• French Patent No. 1,251,772 describes the manufacture of such a paper box.
• This box includes a box body with a cover mounted telescopically on the end of the box body.
• the method of manufacturing this type of box consists of winding several layers of paper helically around a longitudinal axis using a shaping mandrel and a conventional winding machine.
• An internal tube is then produced in a dull ex ⁇ tube and then cutouts are made from the outside to the inside so as to cut the layers of the outer tube to the inner tube and then from the inside to the outside. so as to cut the layers of the inner tube outwards to the outer tube. These two cuts are spaced along the longitudinal axis so as to obtain a telescopic interlocking.
• tops and bottoms closing the internal and external tubes forming the box body and the cover may for example be metallic and are of known type. They allow the complete closure of the box.
• this manufacturing process it is planned to wind four layers of paper and only the second and the fourth layers have an internal coating ad- hesitates so that there is no presence of adhesive between the two inner layers and the two outer layers.
• industrial manufacturing provides for the production of very long tubes which are cut to the dimensions of the boxes to be obtained, each of these sections being treated as indicated above so as to produce a box in sections.
• Such boxes are easily made of paper because this material is easily suitable for helical winding, especially in small thickness, but such a manufacturing process seems difficult to transpose to the production of wooden, plastic or all boxes other sheet material such as leather or certain fabrics, in addition to making manufacturing more complex.
• the problem of helical winding is to require a double cut, one outside for the outer tube and the other inner for the inner tube, which becomes tricky for wooden boxes. , or in materials that are difficult to cut. It is increasingly sought after, especially for luxury products, quality packaging with a certain aesthetic effect, and we also know that wood is a noble material and - that its very texture gives it, especially for certain species , a refined aesthetic, both by its visual appearance and by the touch it provides.
• wood Another advantage of wood is the fact that it can receive different forms of "printing" both reported, such as labels, and produced in bulk by direct printing.
• the distributors are looking for forms of revolution and with interlocking of the cover on the body without projecting one of the elements relative to the other. The nesting is done.
• the process involves gluing sheets of wood onto an expandable mandrel.
• the tubes obtained with different diameters and heights are nested and glued to each other. By playing on the heights, you can make rebates.
• the industrialization of such a process would prove difficult to say the least and would lead to a prohibitive product cost.
• the product obtained it is composed of several parts (cover, body, top, bottom) produced independently with their own tolerances, which distances this process from the solutions to solve the problems which the present invention overcomes.
• the purpose of the present invention is to provide a manufacturing process which makes it possible to produce packaging, in particular for luxury products from sheet materials, including unrolled or sliced wood, packaging which does not present - No protruding part during the fitting of the cover on the box body, which has good mechanical strength, which can be made wider than tall or taller than tall indifferently, the steps of which can be automated , whose precision is very high which leads to an excellent adjustment of the nesting.
• the method according to the invention comprises a variant of the main embodiment in which the adjustments of the rolled sheets are made with a straight edge.
• the invention also relates to the chain of fa ⁇ brication of this box which allows to implement the main embodiment of the method, this chain comprising an original succession of machines of known type.
• the device allowing the implementation of the variant provides an original arrangement of known means.
• the subject of the invention is also the box thus obtained, which has a section of revolution, but whose profile can vary infinitely and whose precision of fitting the cover onto the body is remarkable since they are from the same room.
• the method of manufacturing a packaging box in particular of wood for elaborate food products, comprises a box body with two coaxial tubes with a bottom as well as a lid with a top. and is characterized in that it comprises the following stages: - cutting from a sheet of flexible material of a first strip of width L and of a length equal to the perimeter PL of the box plus an area e . of cover,
• the first strip has a height JX_ of between 1 and L.
• the beveled end overlap areas are sanded so as to limit the excess thicknesses. Otherwise :
• the top and bottom of the cover and the bottom of the box are produced respectively by fixing a first plate of external dimensions greater than those of the box and of a second plate of external dimensions comprised between the internal dimensions and outside the box;
• the first plate is sanded after mounting until it gives the exact external dimensions of the cover and / or the box body.
• each strip has a length equal to n times the perimeter so as to produce a cover and a box body with n layers each.
• the subject of the invention is also the chain of fa ⁇ brication allowing the implementation of the method, this chain comprising:
• a variant of the production line is provided, more particularly a variant of the part allowing the body of the box and the lid to be produced.
• the invention also relates to the box produced according to the method by means of the manufacturing line of the invention, this box being characterized in that the cover is telescopically interlocked with respect to the box body and in that the winding is concentric.
• the box when it is made of wood comprises external layers of the box body and of the cover made of noble essence while the intermediate layers during the production of multilayer boxes are in economic essence.
• FIG. 1 represents a block diagram of the first embodiment of the manufacturing method according to the invention
• FIG. 2 represents a side elevation view after butting and gluing and before the strips are rolled up
• FIG. 3 represents a sectional view along line 3-3 of FIG. 2,
• FIG. 4 represents a view of the box in cross section with respect to the longitudinal winding axis
• FIG. 5 represents a view in longitudinal section along line 5-5 of FIG. 4,
• FIG. 6 represents a side elevation view of a multilayer assembly
• FIG. 7 represents a detail view in longitudinal section of the connection of the cover with the box body
• FIG. 8 represents a detailed view of the lower part of the box body and of the bottom link
• FIG. 9 represents a view of the production line concerning the winding step
• FIG. 10 corresponds to the winding step of FIG. 9 at a later stage
• FIG. 11 represents the winding at an even more advanced stage than that of FIG. 10,
• FIG. 12 represents the sanding and milling step for the installation of the tops and bottoms
• FIG. 13 represents a view of this same production line during the final sanding and cutting of the cover using a radial saw or a sharp blade
• FIG. 14 represents a box obtained using a second embodiment of the method according to the invention
• FIG. 14A represents an embodiment of a tool for cutting and finishing edges
• FIGS. 15 and 16 represent cross sections along lines 15-15 and 16-16 of FIG. 14,
• FIG. 17 represents a side elevation view of the second embodiment of the device allowing the implementation of the second embodiment of the process.
• FIG. 18 shows a top view of the positive device of Figure 17.
• Figure 1 is shown schematically the different stages of manufacturing a box according to the invention, these steps being referenced by the letters A to J It is recalled that the embodiment described below is specific to wooden products but it should in no case be considered as limiting. The process is described in a simplified manner and makes it possible to produce a so-called simple box with a single layer as will be indicated below.
• Step A consists in preparing the material sheets for the subsequent steps.
• step B the plate 10 intended for manufacturing the first bands is bevelled with a bevel. to an inclined belt sander 26, likewise the plate 12 is sanded on the opposite side by an inclined belt sander 28.
• the plates 14 and 16 do not undergo any additional mechanical treatment.
• step C the plate 10 is cut to generate several first strips, only one of them being shown for the simplification of the diagram.
• plate 12 it is also planned to cut the second strip 32, but this is generally printed and has a mention 34.
• the plates 14 and 16 are marked with a view to their cutting, these plates 14 and 16 being pre ⁇ viewed respectively for the production of the plates 36 from above and 38 from below and from the bodies 40 and 42 from above and below. of box.
• step D_ there is a first strip 30, bi ⁇ seamed in its part 31, a second band 32, bi ⁇ seamed in its part 33 and presented turned over, the mention 34 then being shown in broken lines.
• top and bottom plates 36 and 38 are also shown turned over, while the top and bottom bodies 40 and 42 are shown in the same position as in the previous step ⁇ _ , but cut out.
• Step E corresponds to tapping the first strip with the second and mounting the top and bottom bodies of the box on the top and bottom of the box.
• This assembly is generally carried out by simple bonding.
• step E provision is also made for the gluing of the first and second strips before the subsequent winding step.
• the butted strips are shown in detail in Figure 2 after gluing.
• the two strips have a width L, and lengths respectively £ 1 for the first strip and £ 2 .
• for the second strip with £ 2 greater than PI so as to take account of the increase in diameter during the subsequent winding as will be described later.
• the two strips are butted together using an adhesive tape 44, placed on a height 1 which determines the external height of the box body.
• the second strip is coated with glue over its entire length £ 2 and over a height 1., as well as over the entire overlap zone located at the free end of this second strip and referenced ⁇ .
• This glue area is referenced 46.
• Figure 3 there is shown a sectional view along line 3-3 of Figure 2, and the identical elements have the same references.
• step F the first and second abutting strips are wound on themselves, the first strip 30 then substantially producing a tube with the overlap zone e . , while the second abutting strip is wound concentrically to form a second tube with the overlap zone ⁇ .
• part 46 comprising adhesive makes it possible to secure the first and second tubes to one another, always along the length ⁇ .
• Figure 5 there is shown an elevational view with the representation in phantom of the internal walls of the box body.
• step G it is planned to sand and mill the can body thus obtained, so as to create an upper 52 and lower 54 over-bore, using a milling machine 50, the assembly being sanded using a sander 48.
• step H the top and bottom of the box can be arranged in the upper and lower part of the box body because the top box body 40 and the bottom box body 42 , penetrate inside the second tube and are positioned in abutment on the walls of the first tube thanks to the overbores 52 and 54.
• top and bottom plates are flush with the upper and lower part of the box body and protrude outside. Peripheral sanding of these claddings, shown in step X, makes it possible to obtain a box body without any projecting element.
• Step J is the final step which consists in cutting the box body, only on the thickness of the outer tube along line 56, shown in broken lines in Figures 1 and 5, in order to separate the upper part of the second strip 32 which forms the peripheral wall of the key cover, this cover being completed by the box top body 40 and the box top plating 36.
• the actual body of the box comprises the lower part of the second strip provided with the adhesive 46 as well as the first inner tube corresponding to the winding of the first strip, the cover coming to style this first tu ⁇ be telescopically.
• FIG. 6 shows a multi-layer variant in which the first strip is made up of three parts 60, 62, 64, the second strip itself being made up of three parts 66, 68 and 70.
• the first strip has a width JX_, the width L_l being itself greater than the width 1 corresponding to the height of adhesive of the gluing zone 72 of the first part 66 of the second strip.
• FIG. 7 The winding of these two multilayer strips is shown in Figure 7 in which we find the first inner tube with the succession of layers 60, 62, 64 bonded to each other, then the succession of layers 66, 68, 70 also glued to each other, the strip 66 itself being glued to the strip 64 over a height 1.
• a peripheral cut 71 is provided for the three layers 66, 68, 70, at a level located above 1 to separate the upper part 72 forming a cover from the lower part 74 forming a box body.
• the top 76 of the cover 72 is substantially more elaborate than the cover described in the first embodiment in the sense that it comprises an upper plate 78 and a lower plate 80 on either side of the body 82 of the can top .
• the inner tube being of a height L _ less than L, it is possible to directly fit the top of the cover 76 by cutting the body of the box top and the veneer sheet 80 lower than the inner profile. exact second tube.
• the upper plating 78 of the cover top 72 is cut to dimensions greater than the dimensions outer parts of the cover 72 and possibly cut and sanded to refine the production.
• Figure 8 shows the lower part of the box body 74 where we find the succession of layers 60, 62, 64 and 66, 68, 70 with interposition of glue between each, the layer devis ⁇ diane being artificially symbolized in a more pronounced way on this representation.
• the underside of the box 84 comprises, in the same way as the cover 76, a body of the underside of the box 86, two bottom plates 88 and top 90.
• the plate 90 has the same dimensions as the bottom plate 80 of the box top, while the lower plating 88 has the same dimensions as the upper plating 78 of this can top, after cutting and sanding.
• the box bottom body 86 it is of identical dimensions to the box top body 82 of the cover 76.
• the first tube composed of the layers 60, 62, 64 can be milled in order to achieve a recess relative to the second tube or more simply, the first strip may include a reduction in its width 1 / at its lower part. It is also specified that in this particular embodiment of the invention, the species of wood, when it is an embodiment in this material, may be different depending on the parts which constitute the first and the second strip.
• FIG. 9 there is shown a production line implementing the method for producing the box which has just been described.
• a bench 100 provided with a pusher-puller 102 for feeding the abutting strips, referenced 104.
• This winding bench 100 comprises a central mandrel 106 of the desired shape of the box, this mandrel having adjustment means 108 making it possible to vary the external shape of this mandrel.
• the box has an oval shape and this mandrel is rotatably mounted in the direction indicated by the arrow 110 thanks to a rotating plate 112.
• Pressing rollers 114 are regularly repaired on the frame mounting bench 100, these rollers being mounted on cylinders 116, of pneumatic type and connected to a centralized supply 118, each of these cylinders being able to be controlled independently.
• these jacks are articulated and include adjustment means 120 relative to the bench.
• systems 122 for glue projection, which allow a glue to be deposited simultaneously with the winding.
• the adhesives used, of the quick setting type allow an effective and almost immediate bonding during the winding. Indeed, the removal of glue beforehand simplifies the process and especially the device. It suffices to melt it, for example by means of heating means 124 which allow more activating the polymerization reaction of the adhesive, in particular with regard to the last layer, which reduces the setting time.
• the orientation, the control of the glue injections are determined by the number of layers, the profile, the speed of rotation and the various parameters of the winding bench 100, these adjustments remaining within the reach of those skilled in the art. .
• the identi ⁇ cal elements bear the same references.
• the manufacturing step shown represents the engagement of the end of the first strip and in FIG. 10 a step is shown in which the plate 112 has rotated around its axis of rotation. vertical so as to cause the strip to wind around the mandrel.
• the different jacks subjected to equivalent pressures, have pistons retracted or in the extended position depending on the position of the mandrel. Also the pressure on the box remains constant.
• FIG. 11 the same elements are referenced identically to those in FIGS. 9 and 10, and the winding bench has almost completed the first winding turn.
• the lids can be fitted and glued onto the box body, which corresponds to step H in FIG. 1, and once the lids are fitted, a new one is provided. rectification using a sander 130, corresponding to step I of FIG. 1, while a cutting tool such as a saw 132, cuts out between the box body proper and the cover, which corresponds to step J of FIG. 1.
• the choice of forms is also varied and one can imagine profiles comprising successive ⁇ sively concave and convex parts while being of revolution.
• the constituent materials of the box can be chosen from cardboard, fabric, leather or other flexible sheet material or else an association of these. Any specific operations required by such or such material are within the reach of those skilled in the art.
• the bonding to be advantageously replaced by more suitable techniques, provided that they are compatible, such as ultrasonic or microwave welding.
• suitable techniques such as ultrasonic or microwave welding.
• the winding comprises several successive stages, without prior abutment.
• each strip is cut, glued and wound successively on the previous one.
• each strip is calculated so that the ends fit one against the other, with contiguous edges.
• the length of these bands increases from the inside to the outside, so as to compensate for the increase in perimeter.
• the box obtained is identical to the box fabri ⁇ ced according to the method described above except that the final end of the last outer strip is adjusted with contiguous edges with the starting end of this same strip. The quality of finish and the resulting appearance depend on the precision of this adjustment.
• the device proposed for the implementation of this variant process for the purpose of producing a multilayer box comprises a supply station 210 in strips, a cutting station 212, a measuring station 214 in length, a station d sizing 216, a winding station 218 and a programmable automat 219.
• the first embodiment of the supply station 210 comprises 5 supply coils 220, 222, 224, 226 and 228, arranged along the same axis 229 of rotation.
• the reels carry strips of wood of different naten ⁇ and different widths depending on the use that will be made of it, internal, median or external part of the box.
• the cutting station 212 comprises a cutter 230, 232, 234, 236 and 238 for each of the strips with corresponding drive means 231, 233, 235, 237 and 239.
• These drive means comprise, in an advantageous manner, a set of rollers and a stepping motor.
• the feeding station and the cutting station are mounted on a bench 240 movable in translation along the double arrow 242 relative to a fixed frame 244 resting on the ground.
• the length measuring station 214 comprises in known manner an optical cell 250, 252, 254, 256 and 258 and an encoder 260, 262, 264, 266, 268 whose rollers are motor and driven by a stepping motor. This measurement station 214 is integral with the fixed frame 244.
• the gluing station 216 comprises a heated tank containing glue of the "hot melt” type with coating rollers.
• This gluing station is integral with a mo ⁇ bile carriage 270 in translation along the double arrow 272, that is to say parallel to the axis 229 of rotation of the coils.
• This trolley serves each measuring station with optical cell 250, 252, 254, 256 and 258.
• the winding station 218 is also integral with the movable carriage 270.
• It comprises a head 274 for winding movable in vertical translation along the double arrow 276 by means of displacement in translation 278 of the screw-nut type and in rotation along arrow 280, thanks to motor means 282.
• the winding head 274 further comprises a man ⁇ drin 284 of the shape of the box to be produced, the shape shown being of the square type with rounded angles.
• the means 278 for displacement in vertical translation are mounted on a second carriage 286 movable in horizontal translation along the double arrow 288, perpendicular to the direction of displacement 272.
• the winding station is completed by means 290 for pressing the strip of wood on the mandrel.
• the device is controlled by a programmable controller 219, shown diagrammatically on the only FIG. 17. This automaton of known type allows the programming of the various operating sequences which will now be described.
• the shape of the box to be manufactured determines the choice of the removable mandrel 284, mounted on the head 274.
• the widths are determined by the dimensions of the box as in the first embodiment. Note in Figure 18 that the strip 222 has a width less than the others. Likewise, the length is programmed in the automaton which will determine the advance of the strip according to needs and the triggering of the cutter. The adjustment of the length of the strip is obtained by displacement of the bench 240 cutter support. The bench 270 is initially placed at the right of the first strip 220.
• a bottom is pressed on the mandrel which will include for this purpose a suction or vacuum system.
• the strip 220 is cut to the programmed length, then it is advanced on the mandrel on which it is pressed.
• the strip sticks to the edge of the bottom of the box carried by the mandrel.
• the gluing station 216 has previously deposited a layer of "hot melt” glue on the part of the strip intended to stick to the edge of the bottom.
• the gluing station will advantageously include means for adjusting the width of adhesive deposited.
• the mandrel moves thanks to its different axes of freedom, along a trajectory such that the man ⁇ drin remains pressed against the pressing means 290.
• the bench 270 moves, as well as the gluing station and the mandrel, to be placed at the right of the second strip.
• the second winding operation takes place after the mandrel has turned slightly, this in order to offset the start of the winding and therefore the interface of the seal.
• the "hot melt” adhesive has an important advantage for this operation since it solidifies very quickly, so that the setting is concomitant with the winding.
• the method comprises the following stages of winding of the other strips, as has just been described. Another step, after winding the different strips, is to finish the edges and cut the cover and the box body in the middle part.
• a simple means enabling this operation to be carried out consists in providing a multi-blade milling cutter 271, in this case three 273, 275, and 277, the spacing is adjustable, depending on the types of boxes.
• the first and third blades 273 and 277 cut the top and bottom edges, while the second blade 275 cuts in the middle part.
• the first and third blades cut across the entire thickness of the winding while the second blade only cuts the cover by leaving a rebate which allows, when in use, a perfect fit of the cover on the box body. It then suffices to recover the box body thus manufactured and finished with its bottom by removing them from the mandrel 284.
• the device comprises as many unwinding stations as there are tape widths. It then suffices to alternate the displacements according to the required widths, each station being able to adapt the length unrolled according to the needs.

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• Engineering & Computer Science (AREA)
• Life Sciences & Earth Sciences (AREA)
• Mechanical Engineering (AREA)
• Wood Science & Technology (AREA)
• Forests & Forestry (AREA)
• Making Paper Articles (AREA)

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• 1992
  • 1992-05-14 EP EP92401325A patent/EP0569648A1/de not_active Withdrawn
• 1993
  • 1993-05-14 AU AU40757/93A patent/AU4075793A/en not_active Abandoned
  • 1993-05-14 EP EP93910124A patent/EP0640029B1/de not_active Expired - Lifetime
  • 1993-05-14 WO PCT/FR1993/000472 patent/WO1993023219A1/fr active IP Right Grant

Non-Patent Citations (1)

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