EP0207407B1 - Boîte pliante - Google Patents

Boîte pliante Download PDF

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Publication number
EP0207407B1
EP0207407B1 EP86108481A EP86108481A EP0207407B1 EP 0207407 B1 EP0207407 B1 EP 0207407B1 EP 86108481 A EP86108481 A EP 86108481A EP 86108481 A EP86108481 A EP 86108481A EP 0207407 B1 EP0207407 B1 EP 0207407B1
Authority
EP
European Patent Office
Prior art keywords
folding box
thinned
box according
areal
blank
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
EP86108481A
Other languages
German (de)
English (en)
Other versions
EP0207407A2 (fr
EP0207407A3 (en
Inventor
Gerhard Seufert
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Seufert Verpackungen GmbH
Original Assignee
Seufert Verpackungen GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from DE19853523416 external-priority patent/DE3523416A1/de
Priority claimed from DE19863605413 external-priority patent/DE3605413A1/de
Application filed by Seufert Verpackungen GmbH filed Critical Seufert Verpackungen GmbH
Publication of EP0207407A2 publication Critical patent/EP0207407A2/fr
Publication of EP0207407A3 publication Critical patent/EP0207407A3/de
Application granted granted Critical
Publication of EP0207407B1 publication Critical patent/EP0207407B1/fr
Expired legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D5/00—Rigid or semi-rigid containers of polygonal cross-section, e.g. boxes, cartons or trays, formed by folding or erecting one or more blanks made of paper
    • B65D5/42—Details of containers or of foldable or erectable container blanks
    • B65D5/4204—Inspection openings or windows
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D5/00—Rigid or semi-rigid containers of polygonal cross-section, e.g. boxes, cartons or trays, formed by folding or erecting one or more blanks made of paper
    • B65D5/42—Details of containers or of foldable or erectable container blanks
    • B65D5/4266—Folding lines, score lines, crease lines
    • 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
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S229/00—Envelopes, wrappers, and paperboard boxes
    • Y10S229/92—Stress relief
    • 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
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S229/00—Envelopes, wrappers, and paperboard boxes
    • Y10S229/93—Fold detail

Definitions

  • the invention relates to a folding box consisting of a first cut part made of opaque material, in particular cardboard, and a second cut part made of transparent rigid plastic film, which is formed over at least one box edge, which is partly formed on a bending line provided in the plastic film, extends and is adhesively bonded to the first blank on its inside, with an overlap between the first and the second blank also at at least one end of the bending line and the bending line is continued by a corresponding crease line in the first blank, to which the box edge goes other part is formed.
  • Such folding boxes consisting of two different materials are known in different designs.
  • the cardboard blank has an opening which represents a viewing window and which is closed by a sheet of rigid plastic (DE-OS 31 48 443).
  • a further known folding packaging (DE 31 52 240 of the int. Note WO 82/00449) not only a viewing window is provided in the cardboard cut part, but several walls or wall parts connected by box edges, including any adjacent closing flaps and dust flaps, are completely out made of a plastic part.
  • the present invention has for its object to provide a folding box of the type specified, in which there are neither outwardly projecting tongues nor holes at the overlap points in the area of folding box edges, and which nevertheless can be folded mechanically at these overlap points without difficulty.
  • the object is achieved according to the invention in that at the overlap points in the area of the box edges between the first and the second blank part, the second blank part is immediately thinned flat to a fraction of its original film thickness at the bending lines, and in that the sheet-like thinnings of the second blank part are reduced extend at least overlap length.
  • the sheet-like dilutions expediently have a substantially constant cross section over their length.
  • a uniform tension equalization over the length in the form of continuous small folds is achieved when the folding box is folded on the relevant edges, i.e. is erected from its lying flat position.
  • the sheet-like thinnings advantageously have a decreasing thickness starting from their lateral edges towards the center, the thickness of the crease lines of the first blank being the smallest. As a result of these measures, the deformability of the sheet-like thinnings along the creasing lines of the first blank part is greatest, which favors the formation of small folds which compensate for the tension.
  • the sheet-like thinners which are of course applied in the plastic film cut part before it is joined to the cardboard cut part by gluing, can be applied by acting on the plastic film from both sides, but are preferably produced by acting on only one side of the plastic film, whereby the plastic film part is on a base.
  • Sheet-like dilutions which are particularly suitable for the intended purpose are achieved if these are applied together with the bending lines by exposure to high frequency / pressure or by hot stamping.
  • care must be taken to ensure that there are no disruptive displacement beads made of the plastic material on the lateral edges of the thinners, so that bonding with the cardboard blank is also possible on the film side, on which such compression beads could occur.
  • the sheet-like dilutions can be designed differently in the pursuit of the inventive concept with the same or approximately the same effectiveness.
  • the sheet-like thinnings are advantageously delimited in an arc shape on one side.
  • they can also be delimited on each side by at least two colliding inclined surfaces.
  • Another possibility is that the sheet-like thinning on each side is limited by two outer inclined surfaces and a central flat surface.
  • a design is also possible in which they are delimited on one side by step-like flat surfaces.
  • three parallel grooves are formed at equal intervals within the sheet-like thinnings, the middle of which is arranged in the extension direction of the associated bending lines in the second blank part. These fine grooves create predetermined folding points at which small regular folds form when the folding box is folded, which ensure the necessary tension compensation and run parallel to the adjacent crease lines in the first blank.
  • the middle groove directly adjoins the bending line, and if the two lateral grooves run at their inner ends each bent and unite with the middle groove at the connection point to the bending line.
  • This groove configuration compensates for the stresses that occur when the box is folded, also at the transition between the bending lines in the plastic film and the sheet-like thinnings, by a roof-like deformation of the small areas of the sheet-like thinnings delimited by the three converging grooves.
  • the minimum thickness in the area of the sheet-like thinnings is approximately 100 ⁇ m.
  • the film thickness at the central groove is approximately one third and the film thickness at the two lateral grooves is approximately two thirds of the minimum thickness in the area of the sheet-like thinnings.
  • the sheet-like thinnings each have a central strip covering the associated crease line of the first blank part and adjoining the associated bending line of the second blank part, which has a constant film thickness at all points and on which the concavely curved to the side Connect transition areas that reach edges continuously.
  • the center strip at a thickness of the plastic film used for the second blank portion between about 200 and 400 J lm a film residue thickness of about 40 has to 60 Jlm, while its width is between about 1/3 to 1/6 of the width of the sheet-like dilution is, the results are particularly good.
  • a folding box designed in accordance with the invention described so far can also be easily folded at the overlap points defined in the area of the box edges defined by crease lines in the first blank part and thus in line with the bending lines in the second blank part, without the carton material of the first blank part being in the area of the crease lines tears open and also without disturbing deformations of the plastic film forming the second blank part in the visible area.
  • all the stresses that occur during folding are compensated for by the sheet-like dilutions present at the overlap points.
  • interruptions can also absorb any residual stresses at the border between the visible area and the carton area, so that tearing of the carton at the carton border and warping of the adjacent film areas are excluded.
  • the interruption is advantageously designed as a line-shaped incision extending transversely to the bending line, which protrudes on both sides beyond the bending line, has the width of the sheet-like thinning and is parallel to the closely adjacent edge of the first blank part runs. The incision hardly appears to the outside and does not form a noticeable hole in the film material, even when the box is upright.
  • the arrangement can be made in a further embodiment of the invention in such a way that the interruption is designed as a hole cutout which is on both sides over the bending line projecting approximately corresponding surface areas and the width of which corresponds at most to approximately the width of the flat thinning.
  • FIG. 1 shows a typical cut of a window folding box, which is composed of a first cut part 1 made of cardboard, which defines the outer contour of the cut, and a second cut part 3, which overlaps a window opening 2 in the cardboard cut part, of transparent, rigid plastic film.
  • the cut results in a cuboid window folding box, the window opening 2 of which extends over its front wall 4 and over partial areas of its adjoining side walls 5 and 6.
  • Your rear wall 7 adjoining the side wall 6 also belongs to the cardboard blank part 1, as do four dust flaps 8 connected to the side walls 5 and 6 and closure flaps 9 connected to the front wall 4. Insert flaps 10 are connected to the closure flaps 9.
  • An adhesive flap 11 is provided on the rear wall 7 for gluing the blank to form a closed box casing, the outer surface of which is glued to the inner surface of the side wall 5.
  • creased lines 12 pressed into the carton, at which the box edges are formed after the folding, erecting and closing of the folding box.
  • the foil blank 3 is glued to the inner surfaces of the front wall 4 and the side walls 5 and 6, overlapping the window opening 2 on all sides in a frame-like manner.
  • the frame-like overlap area is indicated by dots in FIG. 1.
  • the entire overlap area is not required for gluing the two blank parts 1 and 3.
  • the adhesive application can be limited to a relatively narrow strip, which is indicated in FIGS. 3 and 4 in the broken overlap areas specified there by dashed lines.
  • the foil cutting part 3 is divided by two bending lines 13 into a front wall part 14 and two side wall parts 15 and 16.
  • the bending lines 13 are continued in alignment by the crease lines 12, which are located between the front wall 4 and the side walls 5 and 6 of the cardboard blank part 1.
  • sheet-like thinnings 17 are provided in the film cut part 3, which will be explained in more detail below.
  • FIG. 2 shows a folding box type which differs considerably from the window folding box according to FIG. 1 on the basis of its cut.
  • This is a folding box that, after gluing, erecting and closing on both sides, has the shape of a cube.
  • no window opening is arranged in the first cut part 18 made of cardboard, but the second cut part 25 made of transparent rigid plastic film forms part of the total cut with its outer contour, so that complete wall surfaces or continuous wall surfaces made of transparent plastic film are produced with this folding box.
  • the first cardboard blank 18 comprises the rear wall 19, two half side walls 20, 21, a small flap 22, a larger flap 23 and four half dust flaps 24.
  • the foldability between these parts is in turn made possible by crease lines 12 pressed into the carton.
  • the second cut part 25 made of transparent rigid plastic film comprises the front wall 26, two side wall parts 27, 28, a larger closure flap 29, a smaller closure flap 30 and four dust flap parts 31 connected to the side wall parts 27, 28.
  • the foldability of the described film parts is in turn determined by in the bending lines 13 attached ensures.
  • the flaps 22 and 29 and the flaps 23 and 30 interact to close the folding box. Since the smaller closure flap 22 of the carton blank 18 is only half the size of the larger closure flap 23 forming the box bottom, the upper box closure as a result of the transparent closure flap 29 also allows an insight into the inside of the box.
  • the two blank parts 18 and 25 are glued to one another in an overlapping manner, which is indicated by the dotted surface area.
  • the parts of the film cut part 25 of larger area namely the side wall part 28 and the two attached dust flap parts 31, overlap the corresponding parts 20 and 24 of the cardboard cut part 18.
  • the gluing between the two cut parts takes place in the dotted area on the inside of the parts 20, 24.
  • the half side wall 21 and the half dust flaps 24 of the cardboard blank 18 connected to it are glued overlapping to the side wall part 27 and the dust flap parts 31 connected to the foil blank 25.
  • FIGS. 3 and 4 from each of which a single overlap point between the cardboard blank 1 and 18 and the foil blank 3 and 25 is shown.
  • the crease line 12 in the cardboard blank part is aligned exactly with the bending line 13 in the foil blank part, so that when folded, a straight edge of the box is created which passes through both materials.
  • the film cut part 3 (25) has the sheet-like thinner 17, which extends over the full overlap length and a little more extends beyond.
  • the sheet-like thinning 17 has an approximately rectangular outer contour, the longer central axis of which coincides with the crease line 12 and the bending line 13.
  • the film blank 3 (25) is thinned to a fraction of the original film thickness in the area of the sheet-like thinnings 17, the thickness within the sheet-like thinner 17 in the middle, i.e. is the lowest in the area of the crease line 12.
  • the cross-sectional configurations of the sheet-like thinner 17 shown in FIGS. 5 to 9 extend essentially over their length. 5 to 9 that the sheet-like thinnings 17 have a decreasing thickness starting from their lateral edges 34 towards the center. The decrease in thickness takes place in different ways in the exemplary embodiments shown.
  • small beads are indicated on the side edges 34 of the sheet-like thinnings, which are produced during the manufacture of the sheet-like thinners by material displacement from the sheet-like thinning.
  • the dimensions of these beads can be kept within limits, so that they do not interfere even when the film cut part 3 (25) is glued with its bead side to the cardboard cut part 1 (18). In the example according to FIG. 12, however, the surface of the film blank part opposite the beads is glued to the cardboard blank part.
  • the flat thinning 17, as shown in FIGS. 5 and 6, can be delimited in an arc shape on one side when viewed in cross section.
  • the sheet-like thinning 17 is delimited on one side by two inclined surfaces 35 colliding in the middle.
  • FIG. 8 shows an embodiment in which the sheet-like thinning 17 is delimited on one side by two outer inclined surfaces 36 and a central flat surface 37.
  • 9 finally illustrates a limitation of the sheet-like thinning 17 by flat surfaces 38 to 40 arranged in steps on one side of the film.
  • the thickness of the sheet-like thinning increases from the lateral edges 34 Middle down.
  • the described delimitation surface profiles of the sheet-like thinnings are achieved by appropriate design of the tool provided for the application of the sheet-like thinnings.
  • the application of the sheet-like thinners 17 can take place simultaneously with the application of the bending lines 13 in one work step, with the aid of the methods customary for the application of the bending lines.
  • high-frequency heating with simultaneous pressure is primarily considered, which results in particularly flexible soft bending edges.
  • Useful results are also achieved by simultaneous hot stamping of the sheet-like thinnings 17 and the bending lines 13.
  • the application of the sheet-like thinners as well as that of the bending lines 13 is advantageously carried out by acting on one side of the plastic film. Both the application of bending lines 13 in the high-frequency process (DE-PS 25 41 324) and in the hot stamping process are so well known that they do not require any further explanation here.
  • the overlap point in question is folded to form a box edge when the sheet-like thinning 17 is carried out according to one of FIGS. 5 and 7 to 9, it is caused by the material compression in the area of the sheet-like thinning 17 in the immediate vicinity of the crease lines 12 of the cardboard blank 1 (18) small folds substantially along the crease line 12, whereby the compressive stresses in the film in the overlap area of the box edge are completely compensated.
  • the process described for the formation of small folds can be supported very significantly if three parallel grooves are formed at equal intervals within the sheet-like thinnings 17, as is shown in the examples in FIGS. 4 and 6.
  • the shaping of these small grooves is carried out simultaneously when the sheet-like thinnings 17 and the bending lines 13 are applied.
  • the middle groove 42 directly adjoins the bending line 13, while the two side grooves 41 and 43 are bent at their ends and join the middle groove 42 at the connection point to the bending line 13 unite. If the sheet-like thinner 17 designed in this way is deformed when the relevant folding box edge is folded, then defined desired folds are formed along the grooves 41 to 43, as is shown in a greatly enlarged manner in FIG. 12. As a result, the overlap point under consideration can not only be folded particularly easily, it also results in a defined film deformation in the thinning area during the stress compensation with the success of the same appearance of all overlap points in the box edge area after the folding box has been erected.
  • FIGS. 12 illustrates the typical formation of an inner bead 44 in the area of the crease line 12 in the cardboard blank part 1 (18).
  • the surface areas of the areal thinnings located between the grooves 41 to 43 stand out from the bead 44 in a roof-like manner when the defined desired folds are formed.
  • the extent of this small, predetermined folding inward in the shape of a roof decreases in the inner end region of the grooves 41 to 43, in which the grooves converge towards the connection point to the bending line 13, as a result of which the film material again approaches the bead 44 in this region.
  • the formation of the desired folds does not lead to the formation of holes in the edge transition area between the folded bending lines 13 and the creasing lines 12, as is illustrated by FIGS. 10 and 11.
  • film thicknesses may be used, which is about in the range between 200 and 400 1 1m.
  • the areal thinned-17 are made so that the minimum thickness in the central region of the areal thinned about 100 1 1m is. Due to the provision of grooves 41 to 43, this minimum thickness at the grooves is still significantly undercut. Good results are obtained when the central groove 42 has a film residual thickness of approximately 30 11 m, while the film residual thickness at the two lateral grooves 41 and 43 is approximately 60 11 m.
  • the exemplary embodiment of the cross-sectional shape of the sheet-like thinner 17 shown in FIG. 13 is also a schematic sectional illustration.
  • the above explanations regarding the exemplary embodiments corresponding to FIGS. 5 to 9 also apply to FIG. 13, unless statements to the contrary are made below. 13, the additional attachment of parallel grooves 41 to 43 corresponding to FIG. 4 is not provided.
  • the above statements for the minimum thickness in the central region of the sheet-like dilutions do not apply.
  • the width of which is indicated by the dimension line provided with the reference number 47.
  • This median strip 45 extends over the entire length of the sheet-like thinner 17 and, when the film cut part 3 (25) is combined with the cardboard cut part 1 (18), covers the associated crease line 12 in the cardboard cut part. Since the central strip 45 extends over the entire length of the sheet-like thinning, it directly adjoins the associated bending line 13 in the film cut part 3 (25).
  • the median strip 45 has a very low constant film residual thickness of approximately 40 to 60 ⁇ m at all points. Good folding results were achieved with a residual thickness of 55 ⁇ m.
  • the specified small film residual thickness is understood to mean a thickness of the plastic film used for the film blank 3 (25) of between approximately 200 and 400 ⁇ m.
  • the width 47 of the central strip 45 is between approximately one third and one sixth of the width of the sheet-like thinner 17, which can be approximately 8 mm. A corresponding width of approximately 8 mm for the sheet-like thinner 17 is also sufficient for the examples described above. Good results have been achieved with a width of the median strip 45 between approximately 1.5 and 2 mm.
  • FIGS. 14, 16 and 18 can in principle be formed on all known types of folding boxes as shown, insofar as these are composed of a first cut part 1, which is formed, for example, of cardboard, and a second cut part 3 made of transparent rigid plastic film .
  • Such assembled folding boxes can be designed in the manner of a window folding box, as is indicated by the window opening 2 in FIGS. 15, 17 and 19 shown on a comparatively smaller scale, or can also have a larger plastic part than a window folding box, which can be found in several Walls or parts of the wall, including adjacent flaps and dust flaps if necessary.
  • the film cutting part 3 and thus also the window opening 2 extends over at least two colliding wall surfaces of the folding box, namely in the illustrated embodiment over the front wall 4 and the side wall 6.
  • the film cutting part has 3 a front wall part 14 and a side wall part 16, which collide on the bending line 13.
  • Thieves train number 7 denotes the rear wall, and the reference number 9 the lower flap of the folding box.
  • the front wall 4 and the side wall 6 of the carton blank 1 are located on both sides of the crease line 12 pressed into the carton. Only one crease line 12 of the folding box and only a section of a bending line 13 are shown in the drawings.
  • the bend line 13 and the crease line 12 are exactly aligned with one another in the case of sheet-like folding box blanks (FIGS. 14, 16 and 18) and form a continuous box edge after the gluing, erecting and closing of the folding box (FIGS. 15, 17 and 19 ).
  • the sheet-like thinner 17 can be applied simultaneously with the application of the bending line 13 in one operation using the methods customary for the application of the bending lines, for example by high-frequency heating of the film with simultaneous pressure.
  • the bending lines produced in this way result in particularly flexible soft bending edges.
  • the sheet-like thinner 17 compensates for the stresses that occur during folding at the overlap point in the film material by means of deformations occurring on it, without the cardboard material being stretched at the edge overlap point until it tears open.
  • residual stresses can occur in the transition area between the sheet-like thinning 17 and the thinned film material of the wall parts 14, 16, in particular in the case of thicker films, because the bending line 13 during the folding process has the tendency, which is also desirable in itself, to shift somewhat outwards, in order to be aligned to form a virtually continuously continuous box edge with the crease line 12.
  • a line-shaped incision 48 is made in the film cutting part 3 between the bending line 13 and the sheet-like thinner 17, which cuts through the material thickness of the film cutting part 3.
  • the incision 48 protrudes on both sides over the bending line 13 and runs parallel to the nearby edge of the cardboard blank part 1. The smaller the distance of the incision 48 from the adjacent edge of the cardboard blank part 1, the less the incision appears when the folding box is upright, as illustrated in FIG. 15.
  • the interruption is designed as a circular hole cut 49 which separates the bending line 13 from the flat thinner 17 and is only hinted overlapped by the cardboard blank 1.
  • the hole cut-out 49 projects with corresponding surface areas on both sides over the bending line 13, as can be seen from FIG. 16. It has been shown that a relatively small diameter of the hole cut-out 48 in relation to the width of the sheet-like thinning 17 is sufficient to bring about the additional stress compensation mentioned at the connection point between the bending line and the sheet-like thinning 17. Due to the small diameter, the hole cutout 49 appears hardly noticeable when the box is erected, as shown in FIG. 17.
  • the hole cutout forming the interruption is in the form of an ellipse 50, the longer axis of which runs parallel to the adjacent edge of the cardboard blank part 1.
  • the ellipse 50 projects with correspondingly corresponding surface areas on both sides of the bending line 13 and is only slightly overlapped by the cardboard blank part 1.
  • the smaller diameter of the ellipse is so small that the box edge of the erected box formed by the bending line 13 and the crease line 12 is only slightly interrupted.
  • the largest diameter of the ellipse 50 is considerably smaller than the width of the sheet-like thinner 17, which, due to the magnification scale used in FIGS. 14, 16 and 18, already appears wider than in reality.

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Claims (23)

1. Boîte pliante, se composant d'une première découpe de matériau opaque, en particulier en carton, et d'une seconde découpe en feuille de plastique rigide transparent qui s'étend au-delà d'au moins une des arêtes de la boîte pliante, formée pour partie d'une ligne de flexion prévu dans la feuille en plastique et qui est assemblée avec la première découpe par collage avec recouvrement sur la face intérieure de celle-ci, où il existe au moins à l'une des extrémités de la ligne de flexion un recouvrement entre la première et la seconde découpe et où la ligne de flexion est poursuivie par un trait de rainage correspondant dans la première découpe, pour former la seconde partie de l'arête de la boîte, caractérisée en ce que, aux points de recouvrement existant au niveau des arêtes de la boîte pliante entre la première et la seconde découpes (1, 18; 3, 25), la seconde découpe (3, 25) est amincie à une fraction de l'épaisseur initiale de la feuille sur une surface poursuivant immédiatement les lignes de flexion (13) et en ce que les plats amincis (17) de la seconde découpe (3, 25) s'étendent au moins sur la longueur du recouvrement.
2. Boîte pliante selon la revendication 1, caractérisée en ce que les plats amincis (17) présentent une section essentiellement constante sur leur longueur.
3. Boîte pliante selon la revendication 1 ou 2, caractérisée en ce que les plats amincis (17) présentent une épaisseur décroissante entre leurs bords latéraux (34) et leur centre, l'épaisseur étant minimale au niveau des traits de rainage (12) de la première découpe (1, 18).
4. Boîte pliante selon l'une des revendications 1 à 3, caractérisée en ce que les plats amincis (17), considérés en coupe, sont délimités sur une seule face par un arc de cercle (figures 5, 6).
5. Boîte pliante selon l'une des revendications 1 à 3, caractérisée en ce que les plats amincis (17) sont délimités sur une seule face par au moins deux surfaces obliques (35) se rejoignant (figure 7).
6. Boîte pliante selon l'une des revendications 1 à 3, caractérisée en ce que les plats amincis (17) sont délimités sur une seule face par deux surfaces obliques extérieures (36) et une surface plane centrale (37) (figure 8).
7. Boîte pliante selon l'une des revendications 1 à 3, caractérisée en ce que les plats amincis (17) sont délimités sur une seule face par des surfaces planes disposées en gradins (38 à 40) (figure 9).
8. Boîte pliante selon l'une des revendications 1 à 7, caractérisée en ce que sont formées au sein des plats amincis (17) trois rainures parallèles et équidistantes (41 à 43) dont la médiane (42) est disposée dans le prolongement de la ligne de flexion correspondante (13) de la seconde découpe (3, 25).
9. Boîte pliante selon la revendication 8, caractérisée en ce que la rainure médiane (42) se raccorde directement à la ligne de flexion (13) et en ce que les deux rainures latérales (41, 43) sont coudées à leurs extrémités intérieures et rejoignent la rainure médiane au point de raccordement avec la ligne de flexion.
10. Boîte pliante selon la revendication 8 ou 9, caractérisée en ce que la rainure médiane (42) est imprimée dans la feuille amincie jusqu'à une épaisseur résiduelle moindre que celle des deux rainures latérales (41, 43), qui sont imprimées jusqu'à une épaisseur résiduelle concordante.
11. Boîte pliante selon une des revendications 1 à 10, caractérisée en ce que, pour une épaisseur de la feuille de plastique utilisée pour la seconde découpe (3, 25) comprise entre 200 et 400 µm, l'épaisseur minimale au niveau des plats amincis (17) est d'environ 100 J.1m.
12. Boîte pliante selon les revendications 10 et 11, caractérisée en ce que l'épaisseur résiduelle de la feuille au niveau de la rainure médiane (42) est d'environ un tiers et celle au niveau des deux rainures latérales (41, 43) d'environ deux tiers de l'épaisseur minimale au niveau des plats amincis (17).
13. Boîte pliante selon l'une des revendications 1 à 12, caractérisée en ce que le collage de la partie en recouvrement entre les deux découpes (1, 18; 3,25) est interrompu approximativement aux bords latéraux (34) des plats amincis (17).
14. Boîte pliante selon l'une des revendications 8 à 12, caractérisée en ce que le collage de la partie en recouvrement entre les deux découpes (1, 18; 3, 25) est interrompu aux rainures latérales (41, 43).
15. Boîte pliante selon l'une des revendications 1 à 14, caractérisée en ce que les plats amincis (17) sont produits par une action sur une seule face de la feuille de plastique.
16. Boîte pliante selon l'une des revendications 1 à 15, caractérisée en ce que les plats amincis (17) sont appliqués en même temps que les lignes de flexion (13) par l'action de hautes fréquences et de pression ou par estampage à chaud.
17. Boîte pliante selon l'une des revendications 1 à 3, 13, 15, 16, caractérisée en ce que les plats amincis (17) possèdent une bande médiane (45) recouvrant le trait de rainage (12) de la première découpe (1, 18), prolongeant la ligne de flexion de la seconde découpe (3, 25), présentant en tous points une même épaisseur résiduelle de la feuille et se poursuivant sans gradin par des surfaces de transition (46) de forme concave allant jusqu'aux bords latéraux (34).
18. Boîte pliante selon la revendication 17, caractérisée en ce que la bande médiane (45) possède une épaisseur résiduelle de 40 à 60 Ilm dans le cas d'une épaisseur initiale de 200 à 400 µm de la feuille de plastique utilisée pour la seconde découpe (3, 25), tandis que la largeur (47) est comprise entre 1/3 et 1/6 de la largeur du plat aminci (17).
19. Boîte pliante selon l'une des revendications 1 à 18, caractérisée en ce que, aux points de raccordement entre les lignes de flexion (13) et les plats amincis (17) sont réalisées dans la seconde découpe (3, 25) des interruptions (48; 49; 50) traversant toute l'épaisseur du matériau et qui, pour l'essentiel, ne sont pas recouvertes par la première découpe (1).
20. Boîte pliante selon la revendication 19, caractérisée en ce que les interruptions prennent la forme d'entailles (48) en forme de trait perpendiculaire à la ligne de flexion (13), dépassant de part et d'autre de cette ligne de flexion, possédant approximativement la largeur des plats amincis (17) et se trouvant parallèlement à l'arête immédiatement adjacente de la première découpe (1).
21. Boîte pliante selon la revendication 19, caractérisée en ce que l'interruption est une ouverture (49; 50) en forme de trou se partageant de manière sensiblement égale de part et d'autre de la ligne de flexion (13) et possédant une largeur correspondant au maximum à la largeur du plat aminci (17).
22. Boîte pliante selon les revendications 19 et 21, caractérisée en ce que, lorsque la seconde découpe (3) est à plat, l'ouverture (49) a la forme d'un cercle.
23. Boîte pliante selon les revendications 19 et 21, caractérisée en ce que, lorsque la seconde découpe (3) est à plat, l'ouverture (50) a la forme d'une ellipse dont le grand axe est parallèle à l'arête adjacente de la première découpe (1).
EP86108481A 1985-06-29 1986-06-20 Boîte pliante Expired EP0207407B1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE19853523416 DE3523416A1 (de) 1985-06-29 1985-06-29 Faltschachtel
DE3523416 1985-06-29
DE3605413 1986-02-20
DE19863605413 DE3605413A1 (de) 1986-02-20 1986-02-20 Faltschachtel

Publications (3)

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EP0207407A2 EP0207407A2 (fr) 1987-01-07
EP0207407A3 EP0207407A3 (en) 1987-10-07
EP0207407B1 true EP0207407B1 (fr) 1989-06-14

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ID=25833603

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86108481A Expired EP0207407B1 (fr) 1985-06-29 1986-06-20 Boîte pliante

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Country Link
US (1) US4733916A (fr)
EP (1) EP0207407B1 (fr)
DE (1) DE3663923D1 (fr)
IL (1) IL79204A0 (fr)

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Also Published As

Publication number Publication date
DE3663923D1 (en) 1989-07-20
US4733916A (en) 1988-03-29
EP0207407A2 (fr) 1987-01-07
EP0207407A3 (en) 1987-10-07
IL79204A0 (en) 1986-09-30

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