FR2788236A1 - Multi-layered product, e.g. for packaging or envelopes, has layer of cardboard and outer layer based on natural fibres - Google Patents

Abstract

The product (101) consists of a layer of cardboard (102) covered on the outside by a layer of material based on natural fibres (103, 104), e.g. of large-mesh jute. The product layers are assembled with adhesive, heated to 60 - 70 deg C and pressed with a force of some 100 kg/sq cm, so that on the opposite side to the mesh layer the cardboard is imprinted with the shape of the mesh.

Description

Laminate product and envelope obtained from this product This

  The invention relates to a laminated product, to its manufacturing process and to its use for making packaging and envelopes. The technical sector of the invention is the field of the manufacture of envelopes made of material made of several linked layers

between them.

  It is known to produce flattened rectangular envelopes, of a format close to A4, for sending documents by post, the walls of which are made of a laminated material essentially composed of paper (or cardboard) and reinforced with a synthetic fabric with large mesh; the fabric is placed between two layers of paper and / or is embedded inside the paper; the synthetic fibers or filaments are fine, like the paper, so that the thickness of the material is of the order of 150 microns; such a material which is both thin and resistant is satisfactory for the production of light envelopes, but

is unattractive.

  An objective of the invention is to propose a new laminated product based on paper and fibers, the aesthetics of which are improved to allow its use for the packaging of various products, and in particular for the production of pouches, envelopes , bags or boxes to contain small objects or articles (perfumery or confectionery for example), or documents or flat objects such as

  bundles of letter paper or correspondence envelopes.

  According to a first aspect, the invention consists in proposing a laminated product which comprises a layer of paper or cardboard and a filamentous outer layer, preferably woven by delimiting large stitches, based on jute fibers and / or fibers of origin

  similar natural products such as hemp, cotton, linen or wool.

  Thanks to the fact that the fiber layer is not covered or hidden by a layer of another opaque material, it is possible to manufacture a package from the laminated product by placing the fiber layer on the outer face of the package, which gives it an attractive visual appearance which results in particular from the relief of the fibers which protrude relative to the layer of paper / cardboard; for this purpose, the fabric can however be covered with a thin layer of a translucent or transparent material, such as a lacquer. Use is preferably made of a layer of cardboard with a thickness at least equal to 100 microns, in particular with a thickness ranging from 150 to 500 microns, and fibers (or threads or filaments) with a diameter at least equal to microns, in particular of diameter in a range from 150 to 600 microns; a laminated product of thickness at least equal to 200 microns, in particular ranging from 250 to 1500 microns, is thus obtained by assembling a layer of cardboard and a layer of woven threads, which are preferably of neighboring thickness. , which is rigid and provided with

parts in relief pronounced.

  It has been found that, surprisingly, it is possible to obtain a good bond between the cardboard layer and the jute fiber layer by bonding, despite the heterogeneities of the fiber fabric and of the fibers themselves; bonding is preferably carried out hot, that is to say at a temperature above 20 C, preferably at a temperature in a range from 30 to 150 C, in particular

  in a range from 50 to 100 C.

  The assembly of the layers preferably comprises an operation of pressing the layers against each other; this promotes uniform bonding by better impregnation of the jute yarns with glue; this also makes it possible to crush the jute yarns and the cardboard layer, if necessary until causing a deformation of the cardboard layer by a punching effect by the fibers; it can result therefrom, on the face of the cardboard layer opposite to the face on which the fibers are glued, the appearance of deformation in relief reproducing the pattern of the jute yarns, which also gives an attractive visual appearance

for this face.

  Use is preferably made of a square mesh fabric whose width is of the order of 5 to 20 times (in particular close to 10 times) the diameter of the threads, preferably of width ranging from 2 to 15 millimeters.

  the use of natural fibers such as jute fibers (Corchorus capsularis and Corchorus olitorius) makes it possible to obtain a product of low cost but nevertheless very attractive thanks in particular to the disparities5 noted in the threads and in the geometry of the meshes after the bonding of the tissue.

  The fabric may in particular consist of threads obtained from natural fibers of several plants, in particular jute fibers

  mixed with flax fibers, which can also be dyed before weaving and / or before gluing.

  The laminated material according to the invention can be used similarly to cardboard, in particular for the manufacture of packaging, decorative objects or models in particular; for this purpose, this material lends itself well to various transformations by cutting, punching,

  forming by folding in particular, gluing or stapling.

  The present invention further relates to a pouch for packaging stationery, that is to say in particular

  letter, card and mailing envelopes.

  It is known to offer for sale a "package" consisting of a cardboard pouch containing an assortment of stationery items of at least two different formats (for example A4 and A5), in particular an assortment of a few tens of sheets of paper, envelopes and / or cards; such pockets may include two main flaps of identical rectangular shape, which are connected by a fold line to fold over each other, and whose format is slightly larger than that of larger items, for contain in closed position; such a pocket illustrated schematically in Figure 1 generally further comprises a closing flap and side flaps (or stops) (ales) extending along 0 two opposite edges of at least one main flap, to maintain the

  items inside the pocket.

  Since the position and dimensions of the side flaps or stops must be adapted to the format of the articles to keep them in place precisely, known pockets are expensive to manufacture because

  they require abutment structures with several (at least two or three) folds as illustrated on the left main pane of FIG. 1; moreover, these pockets require great precautions in order to avoid5 cornering the fragile stationery when forming a package.

  An object of the invention is therefore to propose a pouch for packaging stationery items which is improved.

  According to one aspect, the invention consists in proposing a pocket, which is at least partly made of rigid cardboard or preferably of a laminated material as described in the present application, which comprises a main flap comprising two opposite edges the along which are folded respectively two side flaps which each have a slot, so that one can arrange and hold in place a bundle (or stack) of large format articles between the main flap and the 15 folded side flaps and can arrange and hold in place a bundle of articles of smaller size, which are engaged in each of the two slots and which extend partly from a first side of each of the side flaps and partly from a second side of each of the side flaps. The invention makes it possible to obtain a pouch which is simple to manufacture, of low cost, easy to fill with articles of different formats; this pocket also makes it possible to keep a bundle of articles of a first format and a bundle of articles of a second format superimposed. According to preferred embodiments of the invention - the slots are not uniformly rectilinear and are preferably curved, and the slots and the side flaps extend symmetrically with respect to a plane perpendicular to the main flap and equidistant from said two opposite edges ; - The pouch according to the invention is obtained by cutting and folding a laminated product described above, and comprises two main flaps joined by a fold, at least one of the main flaps comprising two side flaps folded along two opposite edges perpendicular to said fold and split, and has a closing flap

  extending one of the main components.

  The advantages of the invention will be better understood from

  through the following description which refers to the accompanying drawings, which

  illustrate without any limiting character preferential modes of

realization of the invention.

  In the drawings, identical or similar elements bear,

  unless otherwise indicated, the same references from one figure to another.

  Figure 1 illustrates in simplified perspective view a pocket

known.

  Figure 2 illustrates in simplified perspective view a pocket

according to the invention.

  Figure 3 illustrates in sectional view along III-III part of the

cover of figure 2.

  Figure 4 illustrates in schematic perspective view a panel

  rectangular of a laminated material according to the invention.

  Figure 5 illustrates in cross-sectional view along V-V the

panel of figure 4.

  With reference to Figures 1 to 3, the invention applies in particular to a pocket comprising two main flaps 1 and 2 separated by a fold line 6 extending along one of their common longitudinal edges, the two flaps being obtained by folding a side of cardboard with regard to the known pocket illustrated in FIG. 1; the main flap 1 is extended along its second longitudinal edge 7 by an end flap 5 for closing the pocket. The main flap 1 of Figures 1 and 2 is extended on two opposite side edges 1a and 1b of a respective side flap 3, 4, under which sheets 9 of paper can engage, so that they are

  held in position between these flaps 3 and 4 and the main flap 8.

  The known pocket illustrated in FIG. 1 further comprises a stop system 10 to 14 forming a frame surrounding the central part of the main flap 2, as well as a cross-member 14, which stops 10 to 14 delimit two housings 15 and 16 suitable for receiving printed documents or other stationery of size close to half the size of the sheets 9 arranged in the housing 8 in the right part of FIG. 1; the stops 10 to 14 are for example made using pieces of cardboard having two or three folds and connecting means or tabs allowing their assembly to the main flap 2 to form a kind of flattened box suitable for receiving in each housing the

  stationery elements arranged in a stack in each housing.

  With reference to FIGS. 2 and 3 in particular, the pouch comprises a first traditional housing 8 open in the upper part and delimited by the main flap 1 and the side flaps 3 and 4 obtained by folding a side of cardboard or of a material laminate according to the invention; according to the invention, the main flap 2 located in the left part is provided on its edges 2a and 2b with two side flaps 17 and 18, each provided with a slot 19, respectively 20, which separates a part 23, 24 d respectively 'end of the flap 17, 18 of its main part attached to the main flap 2; these slots 19, 20 allow by deformation of the flaps 17, 18, the creation of an elongated opening 21, respectively 22 illustrated in Figure 3, allowing the introduction of the end portions of flat articles 9b (such as envelopes whose format is smaller than other flat articles 9a), which are arranged against the bottom or main flap 2, between the latter and the flaps 17 and 18; the articles of small format 9b, of rectangular shape, extend in their central part above the parts 23, 24 of the flaps 17 and 18 and extend in their end part, under the said flaps 17 and 18; they are held in place by the appropriate length of the slots 19 and 20; this arrangement allows the easy introduction and extraction of the articles 9b from the slots 19 and 20, and also allows the easy introduction and extraction of the articles 9a under the flaps 17 and 18; these flaps are preferably secured to the main flap 2, over part of their edges 17a, 17b, 18a, 18b extending

  along the longitudinal edges 6 and 25 of the main flap 2.

  Each slot 19, 20 comprises a rectilinear central part parallel to the edge 2a, 2b for folding the flaps 17, 18; the central part is extended at each of its two ends by a curved slot part; this arrangement facilitates the deformation of the flaps for the formation of the openings 21, 22 allowing the passage of the articles 19b. With reference to FIGS. 4 and 5, the laminated material 101 consists of a layer of cardboard 102 on the upper face 105 of which is bonded a fabric consisting of weft threads 103 and

  chain 104 made from jute fibers.

  According to an exemplary embodiment, the size of the square meshes 107 of the jute fabric is of the order of 5 millimeters and the thickness 108 of the cardboard layer is close to 500 microns, the jute yarns having a

  diameter of the order of 300 microns.

  The manufacturing of the laminated product comprises, according to an exemplary embodiment, the following successive operations: - gluing of the face 105 of the layer 102 of cardboard, - deposition, on the glued face 105, of fabric 103, 104 of jute, - pressing jute fabric against the cardboard layer at a pressure of around 100 kilos per cm2 and at a temperature close to

60 to 70 C.

  In the case of using such a hot gluing and pressing process, it is possible, as illustrated in FIG. 5, to deform the layer 102 of cardboard and the appearance on the face 106 of this layer which is opposite. to the face 105 on which the fiber fabric 103, 104 is stuck, of relief deformations 106a in a pattern approximately repeating the mesh pattern of the fiber fabric stuck on the

face 105.

  The surface mass (or grammage) of the paper or cardboard used, which varies according to the density of the cardboard and its thickness, is preferably in a range from 150 to 600 grams per m2 in

  particular from 200 to 300 grams per m2.

Claims (10)

  1. Laminated product (101), characterized in that it comprises a layer (102) of cardboard and an outer layer based on natural fibers (103, 104). 2. Product according to claim 1, which consists of a layer of thick cardboard on one side (105) of which a fabric is stuck.   (103, 104) of large mesh jute (107).   3. Product according to claim 2, the thickness of which is in a range from 250 to 1500 microns.   4. Product according to any one of claims 1 to 3, in which the cardboard layer is provided, on its face (106) opposite to   that (105) where the fibers are bonded, of formations (106a) in relief reproducing the pattern of the meshes of the fabric based on natural fibers. 5. Method of manufacturing a laminated product according to one   any one of claims 1 to 4, in which it is assembled by gluing   the layers that are heated and pressed.   6. Packaging obtained by cutting and forming in particular, of a   product according to any one of claims 1 to 4.   7. Pouch for packaging stationery items at least part of which consists of a laminated product according to any one of claims 1 to 4.   8. A pouch according to claim 7, which comprises a main flap (2) comprising two opposite edges (2a, 2b) along which two lateral flaps (17, 18) are respectively folded, which each have a slot (19, 20), so that one can arrange and hold in place a bundle (or stack) of large format articles (9a) between the main flap and the folded side flaps and one can dispose and maintain in place a bundle of articles (9b) of smaller size, which are engaged in each of the two slots and which extend in part from a first side of each of the side flaps and in part   on a second side of each of the side flaps.   9. A pouch according to claim 8, in which the slots are not uniformly rectilinear and are preferably curved, and in which the slots and the side flaps extend symmetrically   relative to a plane (26) perpendicular to the main flap (2) and equidistant from said two opposite edges (2a, 2b).   10. Pouch according to any one of claims 7 to 9,   which is obtained by cutting and folding a product according to any one of claims 1 to 4, which has two flaps (1, 2)   main joined by a fold (6), at least one of the main flaps comprising two lateral flaps (17, 18) folded along two opposite edges (2a, 2b) perpendicular to said fold and split, and which comprises a   closing flap (5) extending one of the main flaps.