FR2823696A1 - Method for producing packaging with closed section comprises winding first sheet around mandrel with natural material sheet directed toward mandrel, second sheet wound with natural material directed to mandrel outside - Google Patents

Abstract

The packaging has a closed section consisting of flaps (F1) formed from a sheet of natural flexible material glued onto a support sheet. The first sheet (F1) is wound around a mandrel (110) with its natural material sheet directed towards the mandrel so that it forms the packaging inner wall. Each second sheet is wound so that it can be glued around the first sheet with its natural material sheet directed to the outside of the mandrel so that it forms the packaging outer wall. The winding stage of each sheet is carried out so that the edge from which the winding begins does not coincide with the edge (F1a) from which the winding of the previously wound sheet begins. An Independent claim is included for packaging produced by the method.

Description

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  The present invention relates to a method for manufacturing a closed section packaging based on sheets incorporating at least one natural material such as wood as well as a closed section packaging made from sheets.

  incorporating at least one natural material such as wood.

  Packages of closed section have long been known, such as circular section packages, such as hollow cylinders, used for example to protect bottles from impact. Among these, there are packaging

  made up of sheets of cardboard wound in a helicoid to form tubes.

  As this is a packaging intended to present valuable products, for example bottles of reputable drinks, such cardboard packaging does not make it possible to obtain a quality of presentation that can be obtained from a natural material such as

wood.

  Also, to manufacture a cylindrical section packaging made of wood, a first solution consists in machining by turning a piece of wood to give it the shape of a tube. CeKe solution is expensive and requires the use of

  pieces of wood with a diameter at least equal to that of the tube to be manufactured.

  The object of the invention is therefore to propose a method for manufacturing a closed section packaging based on sheets incorporating at least one natural material such as wood, and which does not require machining. a piece of wood and the

cost price is advantageous.

  To this end, the method of manufacturing a closed section packaging based on sheets respectively formed from a sheet of flexible natural material laminated to a support sheet, is remarkable in that it consists in winding a first sheet around '' a mandrel, the sheet being positioned with its sheet of natural material turned towards said mandrel so that it can form the internal wall of said packaging, to glue the external wall of the sheet or the internal wall of at least a second sheet, to wrap each sheet to stick it around the first sheet or a previously rolled sheet, the last sheet being positioned with its sheet of natural material turned towards the outside of the mandrel so that it can form the wall outside of the packaging, the winding step for each light and working in such a way that the starting edge of the winding of the sheet does not coincide s with the winding start edge of the

  first sheet or a previously rolled sheet.

  In this way, the production of the closed section packaging is simplified.

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  According to another characteristic of the invention, the manufacturing method consists in providing, in addition, a step of winding and gluing a reinforcing sheet between two sheets, the step of winding the reinforcing sheet s operating in such a way that the starting edge of the winding of the reinforcing sheet does not coincide with the starting edge of the winding of the leaves. According to another characteristic of the invention, the manufacturing process consists in shifting the starting edges of winding of two sheets or reinforcing sheet (s) intended to be glued to each other, by an angle cc centered on the axis of the mandrel of a

  value close to: 2 / number of sheets and backing sheets.

  According to another characteristic of the invention, the manufacturing process consists in respectively making perforations through sheets or reinforcement sheet (s), the perforations being centered on the same axis during their winding stages. According to another characteristic of the invention, the manufacturing process also provides for a step of winding and gluing a sheet of transparent plastic between two sheets or sheet (s) of reinforcement so as to close

the perforations.

  According to another characteristic of the invention, the manufacturing process consists in heating the mandrel to facilitate the winding of sheets or reinforcing sheets

  around it and speed up the drying time of the glue.

  According to another characteristic of the invention, the manufacturing process consists in establishing the temperature of the mandrel around 40 C. According to another characteristic of the invention, the manufacturing process consists in pressing, by a pressing roller, the sheets or reinforcement sheets or

  transparent plastic material when they are wound on the mandrel.

  According to another characteristic of the invention, the manufacturing process consists in maintaining the sheets or reinforcement sheets or transparent plastic sheet around the mandrel, during the time of drying of the glue, by

  tightening means such as straps.

  According to another characteristic of the invention, the manufacturing process consists in dipping the packaging in a paraffin bath to give its walls a

  tightness towards the outside.

  The invention also relates to a packaging of closed section consisting of sheets respectively formed from a sheet of flexible natural material laminated

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  on a support sheet. Such a packaging is remarkable in that the sheets are glued by their faces in contact, and are arranged relative to each other in such a way that, on the one hand, the starting winding edge of each sheet does not coincide with the starting edge of winding of the sheet or of another sheet and, on the other hand, that their sheets of natural material respectively constitute the

  inner and outer walls of the package.

  According to another characteristic of the invention, the support sheet is a sheet

of cardboard.

  According to another characteristic of the invention, the natural material of each

  natural material sheet is chosen from wood, cork or leather.

  According to another characteristic of the invention, the packaging further comprises a reinforcing sheet disposed between two sheets, the starting edge for winding the reinforcing sheet not coinciding with the starting edge for winding the sheets. According to another characteristic of the invention, the reinforcing sheet is a

glass fiber sheet.

  According to another characteristic of the invention, the reinforcing sheet is a

plastic sheet.

  According to another characteristic of the invention, the angle centered on the axis of the package and taken between the starting winding edges of two adjacent sheets or reinforcing sheets, has a value close to: 2 TC / number of sheets and

reinforcement sheets.

  According to another characteristic of the invention, the openings of the packaging

  are respectively closed by a bottom and a cover made of wood.

  According to another characteristic of the invention, the external wall and / or the bottom or

  the cover has a marking produced by pyrography.

  According to another characteristic of the invention, the openings of the packaging

  are respectively closed by a bottom and a cover made of metal.

  According to another characteristic of the invention, the sheets or sheet (s) of

  reinforcement respectively comprise perforations centered on the same axis.

  According to another characteristic of the invention, the perforations are closed by a transparent plastic sheet placed between two sheets or

reinforcement sheet (s).

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  The features of the invention mentioned above, as well as others,

  will appear more clearly on reading the following description of an example of

  realization, said description being made in relation to the attached drawings, among

  which: Fig. 1a represents a front view of a device for manufacturing a packaging of closed section of circular type according to the invention, FIG. lb shows a sectional view of one of the sheets intended for the manufacture of a closed section package according to the invention, FIG. 2 shows a front view of a device for manufacturing a packaging of circular section during a step of winding a first sheet according to the method of manufacturing a packaging of circular section according to the invention, the Fig. 3 shows a front view of a device for manufacturing a packaging of circular section at the end of the step of winding a first sheet according to the method of manufacturing a packaging of circular section according to the invention , Fig. 4 shows a front view of a device for manufacturing a circular section packaging during the preparation of the step of winding a second sheet according to the method of manufacturing a circular section packaging according to the invention , Fig. 5 shows a front view of a device for manufacturing a packaging of circular section during the step of winding a second sheet according to the method of manufacturing a packaging of circular section according to the invention, the Fig. 6 shows a front view of a device for manufacturing a packaging of circular section at the end of the step of winding a second sheet according to the method of manufacturing a packaging of circular section according to invention, FIG. 7 shows a perspective view of a circular section packaging manufactured by the manufacturing method according to the invention, FIG. 8 shows a front view of a device for manufacturing a packaging of circular section at the end of the step of winding a sheet covering a reinforcing sheet according to a variant of the operating method of the manufacturing process. 'a circular section packaging according to the invention, Ài.

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  Fig. 9 shows a perspective view of a circular section packaging manufactured in a variant of the operating method of the manufacturing process according to the invention, and FIG. l O represents a perspective view of a circular section packaging manufactured in another variant of the operating method of the

manufacturing according to the invention.

  In Fig. 1, the device 100 for manufacturing a package of closed section comprises in particular a mandrel 110 intended to allow the winding of sheets F around it. It has for this purpose a pressing roller 120 making it possible to press one or more sheets F or other sheets against the mandrel 110 1ors of their respective windings. The pressing roller 120 can, for this purpose, be kept under pressure against the mandrel 110 by a non-pressing device

  shown incorporating a pressure means such as a cylinder or a spring.

  Furthermore, the mandrel 110 can be heated by a changing means, not shown, such as an electrical resistance, and which is intended to facilitate winding.

sheets around him.

  In Fig. 1, the mandrel 110 and the pressing roller 120 have a cylindrical section making it possible to manufacture packages of cylindrical section. In an embodiment not shown, the mandrel has a convex or concave polygonal section. The mandrel 110 and the pressing roller 120 are rotated in opposite directions from each other by a device not shown, and preferably mutually so that their peripheral speeds are substantially equal. A removable clamp 130 is mounted at the periphery of the mandrel 110 in a median plane thereto. It is provided with a groove 132 making it possible to house an edge Fla intended for the start of the winding of a first sheet F1 around the mandrel 110. Thus, when the mandrel 110 and the pressing roller 120 are rotated , the sheet F1 is wound around said mandrel 11 O. The manufacturing device 100 also includes a support 200 intended to support a sheet F or another sheet before it is wound up. It includes a flat seat 210 capable of receiving the sheet F. and the plane passing through said seat 210 is tangent to the envelope of the mandrel 110. The height of this seat 210 can be modified in such a way that the plane passing through that -this can be offset by li '

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  relative to the cylindrical envelope of the mandrel 110, of a height multiple of that of the thickness of a sheet F. It will be noted that the plane passing through the support 200 intersects that passing through the axes of the mandrel 110 and the roll of pressing 120 at a right angle, so that the driving of the sheet F by the pressing roller 120 and by the mandrel 110 takes place in a direction parallel to that of the seat 210. The support is bordered laterally by two rails 220 of which only one rail 220a is visible in this FIG., and which are intended to guide in a rectilinear movement each sheet F. For this purpose, the rails 220 are spaced a distance slightly greater than the height of a sheet F. In FIG. 2, each sheet F intended for the manufacture of a closed section packaging consists of a sheet of flexible natural material Fb such as wood, cork or leather and which is laminated on a support sheet Fc preferably in

  cardboard. Advantageously, the sheet of natural material Fb is a sheet of wood.

  The manufacture of a closed section packaging takes place as follows. The mandrel 110 is preferably heated by its changing means. The heating temperature of the mandrel 110 is preferably established around 40 C. In FIG. 1, a first sheet F1 is deposited on the seat 210 so that its sheet of natural material Fb is turned towards the mandrel 110 so that it can form the internal wall of a package, then its edge F 1 a of winding start is inserted between the pressing roller 120 and the mandrel 110, before being brought into the groove 132 of the clamp 130 in a direction indicated by the arrow A in FIG. 1. The mandrel 110 and the pressing roller 120 are then rotated in the directions indicated by the arrows B and C respectively. In FIG. 2, the sheet F1 then wraps around the mandrel 110 along the arrow B. The length of this first sheet F1 is such that it is at most equal to the circumference of the mandrel 110 and preferably equal to or slightly less than this circumference . In Fig. 3, the sheet F1 is completely wound on the mandrel 110. The edge Fla and its opposite edge Flb are now arranged opposite one another. The sheet F1 then forms a cylinder. The edge Fla is held in the groove 132 of the clamp 13O, while the opposite edge Flb is kept pressed between the roller

pressing 120 and the mandrel 110.

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  In Fig. 4, the outer wall of the sheet F1 is then glued. A second sheet F2 can then be rolled up and glued to the sheet F1 in the following manner. The sheet F2 is deposited on the seat 210 so that its sheet of natural material Fb is rotated towards the outside of the mandrel 110 so that it can form the external wall of a package. Before inserting the starting edge F2a for winding the sheet F2 between the pressing roller 120 and the mandrel 110 to initiate the bonding of the sheet F2 on the sheet F1, the mandrel 110 is previously rotated so that the edge F2a of sheet F2 does not coincide, when

  collage, with the edges Fla or Flb of the sheet F1.

  Advantageously, the angle x indicated in FIG. 5 which is centered on the mandrel and taken between the starting edge Fla of winding of the first sheet F1 and the

  starting edge F2a for winding the second sheet F2 has a value close to.

  2 / number of sheets F. that is to say a value close to 180 C in this FIG. In Fig. 5, the edge F2a of the sheet 2 is then inserted between the mandrel 110 and the glued outer wall of the sheet F1 in a direction indicated by the arrow A. The mandrel 110 and the pressing roller 120 are rotated according to the arrows respectively B and C. The pressing roller 120 presses the sheet F2 against the sheet F1, which causes the intimate mutual bonding of the two sheets F1 and F2 by their faces in contact. When the mandrel 110 is heated, the heat

  released by it accelerates the drying time of the glue.

  In Fig. 6, the mandrel 110 has performed a complete rotation. It will be noted that the length of this second sheet F2 is such that it is at most equal to the circumference of the first sheet F1 and preferably equal to or slightly less than this circumference. The removable clip 130 is removed. The pressing roller 120 can be held in position to confirm the bonding of the edge F2b opposite the edge

  F2a and arranged opposite it.

  The packaging of circular section thus produced can then be removed laterally from the mandrel 110. Such packaging is shown in FIG. 7. It is made up of sheets F1 and F2, and its internal and external walls are made up

  respectively of a sheet of natural material Fb.

  Advantageously, the angle indicated in FIG. 7 which is centered on the axis of the packaging and taken between the starting edge Fla for winding the first sheet F1 and the starting edge F2a for winding the second sheet F2 has a value close to: 2 / number of sheets F. that is to say a value close to 180 C in this FIG.

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  Other sheets F can be wound and glued successively, in the same manner as described above, the winding and gluing of a

F2 slip.

  In a variant of an operating mode shown in FIG. 8 of the manufacturing process, it is advantageous to incorporate a step of winding and gluing at least one reinforcing sheet T1, such as a sheet of glass fibers, in order to stiffen the packaging or a plastic sheet forming in addition a sealing of the walls of the packaging. Each reinforcement sheet should be rolled up and glued

  Tl in the same way as an F2 sheet, as previously described.

  However, each reinforcing sheet T1 must be wound between two sheets F1 and F2, as shown in FIG. 8, that is to say that it is preferably glued to its outer wall and then covered with an F2 sheet wound and glued in a manner

  identical to what has been described previously.

  It will be noted that the angle indicated in FIG. 8 which is centered on the mandrel 110 and taken between the winding starting edges Fla and Tla or Tla and F2a or F2a and Fla of two sheets F1, F2 or T1 reinforcement sheets adjacent to a value close to: 2 / number sheets F and reinforcement sheets T1, that is to say close to 120 C in this FIG. An exemplary embodiment of a circular section packaging produced by this variant of the operating method of the manufacturing process is shown in FIG. 9. This packaging is constituted in this FIG. a reinforcement sheet T1 sandwiched between two sheets F1 and F2. The internal and external walls of the packaging of the invention always consist respectively of a sheet of natural material Fb in order to present the appearance of a packaging made of a material

natural.

  Advantageously, the angle indicated in FIG. 9 which is centered on the axis of the packaging and taken between the winding starting edges Fla and Tla or Tla and F2a or F2a and Fla of the sheets F1, F2 or reinforcement sheets T1 has a value close to: 2 / number of sheets F and reinforcement sheets T1, that is to say close to 120 C in this FIG. Furthermore, the inner and outer walls of the packaging being made of a natural material Fb, it is possible to show on them a marking

  M produced by pyrography, as shown in FIG. 7.

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  A bottom and a cover made in a natural material are suitable for closing the openings of the packaging. Bottom and lid

  can also be pyrographed.

  The bottom and the cover may, in one embodiment, be made of metal.

  The manufacturing method of the invention makes it possible to manufacture packages of closed section essentially produced in a natural material with a manufacturing cost comparable to those manufactured from sheets of cardboard wound in a helicode.

  The process also allows the marking of packaging by pyrography.

  In a variant of an operating mode not shown, the sheet or sheets F or reinforcement sheets T1 can be held around the mandrel 110 during the drying time of the glue by clamping means, such as strapping,

  enveloping the periphery of said sheets F or reinforcement sheets T1.

  In a variant of a procedure not shown, the packaging is soaked in a paraffin bath to give its walls a seal against

from the outside.

  In a variant of another operating mode, not shown, perforations are made through sheets or reinforcement sheet (s) F1, T1, F2. These perforations P are centered on the same axis during their winding steps. One can also provide a step of winding and gluing a sheet of transparent plastic S between two sheets or sheet (s) of reinforcement F1, T1, F2 so as to close the perforations P. An example of embodiment of a closed section packaging of circular type produced by this variant of the operating method of the manufacturing process is shown in FIG. 10. This packaging respectively have perforations P centered on the same axis allowing to see inside the packaging to assess the (s)

  product (s) intended to be contained therein.

  To avoid the introduction of dust inside the packaging, the perforations P are closed by a transparent plastic sheet S. r

2823696

REVFNDICATIONS

  1) Method for manufacturing a closed section packaging based on sheets (F1, F2) respectively formed from a sheet of flexible natural material (Fb) laminated on a support sheet (Fc), characterized in that it consists winding a first sheet (F1) around a mandrel (110), the sheet (F1) being positioned with its sheet of natural material (Fb) facing said mandrel (110) so that it can form the inner wall of said package, to glue the outer wall of the sheet (F1) or the inner wall of at least one sheet (F2), to wrap each sheet (F2) to glue it around the first sheet (F1) or a sheet (F2) previously wound, the last sheet (F2) being positioned with its sheet of natural material (Fb) turned towards the outside of the mandrel (110) so that it can form the external wall of the package , The step of winding each sheet (F2) operating in such a way that the he starting edge (F2a) for rolling up the sheet (F2) does not coincide with the starting edge (Fla, F2a)

  winding the first sheet (Fl) or a sheet (F2) previously wound.

  2) The manufacturing method according to claim 1, characterized in that it consists in providing, in addition, a step of winding and gluing a reinforcing film (T1) between two sheets (F1, F2) or (F2, F2), the step of winding the reinforcing sheet (T1) taking place in such a way that the starting edge (Tla) of winding the reinforcing sheet (T1) does not coincide with the edge (Fla, F2a) of

  leaf winding start (F1, F2).

  3) Manufacturing method according to claim 1 or 2, characterized in that it consists in shifting the winding start edges (Fla, Tla, F2a) of two sheets or sheet (s) of reinforcement (F1, T1, F2) intended to be glued to each other, at an angle a centered on the axis of the mandrel (110) with a value close to: 2 / number of sheets

  and reinforcement sheets (F1, T1, F2).

  4) Manufacturing method according to one of claims 1 to 3, characterized in that

  that it consists in respectively making perforations (P) through sheets or reinforcement sheet (s) (F1, T1, F2), the perforations (P) being centered on the same axis

  during their winding stages.

  5) The manufacturing method according to claim 4, characterized in that it consists in further providing a step of winding and gluing a sheet of transparent plastic material (S) between two sheets or sheet (s) of reinforcement (F1, T1,

  F2) so as to close the perforations (P).

  6) manufacturing method according to one of claims 1 to 5, characterized in that

  that it consists in heating the mandrel (110) to facilitate the winding of sheets (F) or reinforcement sheets (T1) around it and to accelerate the drying time of the glue. 7) The manufacturing method according to claim 6, characterized in that it consists in establishing the temperature of the mandrel (110) around 40 C.

  8) manufacturing method according to one of the preceding claims,

  characterized in that it consists in pressing, by a pressing roller (120), the reinforcing sheets or sheets or transparent plastic sheet (F1, T1,

  F2, S) during their windings on the mandrel (110).

  9) Manufacturing method according to one of the preceding claims,

  characterized in that it consists in maintaining the reinforcing sheets or sheets or transparent plastic sheet (F1, T1, F2, S) around the mandrel (110), during the glue drying time, by means of tightening, such as strapping.

  ) Manufacturing method according to one of claims 1 to 4 or 6 to 9,

  characterized in that it consists in dipping the packaging in a paraffin bath to

  give its walls a seal against the outside.

  11) Package of closed section, the package consisting of sheets (F1, F2) formed respectively of a sheet of flexible natural material (Fb) laminated on a support sheet (Fc), characterized in that the sheets (F1, F2) are glued by their faces in contact, and are arranged relative to each other in such a way that, on the one hand, the starting edge (F2a) of winding of each sheet (F2) does not not with the starting edge (F la, F2a) for winding the sheet (F1) or another sheet (F2) and, on the other hand, that their sheets of material

  natural (Fb) respectively constitute the inner and outer walls of the package.

  12) Packaging according to claim 11, characterized in that the sheet

  support (Fc) is a sheet of cardboard.

  13) Packaging according to claim 11 or 12, characterized in that the natural material of each sheet of natural material (Fb) is chosen from wood, cork

or leather.

  14) Packaging according to claim 11, 12 or 13, characterized in that it further comprises a reinforcing sheet (T1) disposed between two sheets (F1, F2) t

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  or (F2, F2), the starting winding edge (F2a) of the reinforcement sheet (F2) does not

  not coinciding with the starting edge (Fla, F2a) for winding the sheets (F1, F2). ) Packaging according to claim 14, characterized in that the sheet of

  reinforcement (T1) is a sheet of glass fibers.

  16) Packaging according to claim 14, characterized in that the sheet of

  reinforcement (T1) is a plastic sheet.

  17) Packaging according to one of claims 11 to 16, characterized in that

  the angle a centered on the axis of the packaging and taken between the winding starting edges (Fla, Tla, F2a) of two adjacent sheets or reinforcement sheets (F1, T1, F2), has a similar value of: 2 tc number of leaves (F) and leaves of

reinforcement (T1).

  18) Packaging according to one of claims 11 to 17, characterized in that the

  packaging openings are respectively closed by a bottom and a cover

made of wood.

  19) Packaging according to one of claims 11 to 18, characterized in that the

  external wall and / or the bottom or the cover include a marking (M) produced by pyrography.

  ) Packaging according to one of claims 11 to 17, characterized in that the

  packaging openings are respectively closed by a bottom and a cover

made of metal.

  21) Packaging according to one of claims 11 to 20, characterized in that the

  reinforcement sheets or sheet (s) (F1, T1, F2) respectively contain

  perforations (P) centered on the same axis.

  22) Packaging according to claim 21, characterized in that the perforations (P) are closed by a transparent plastic sheet (S) disposed between