FR2497771A1 - SHEET MATERIAL COVER FOR RECTANGULAR CONTAINER AND METHOD FOR MANUFACTURING THE SAME - Google Patents

Abstract

LID IN FLAT MATERIAL INTENDED TO BE SET WITH ALL SIDES ON A PERIPHERAL EDGE AND ROUNDED AT THE CORNERS OF A RECTANGULAR CONTAINER, IN PARTICULAR OF A FOOD TRAY. THIS COVER CONSISTS OF A KNOWN SHEET 10 PIECE, SENSITIVELY RECTANGULAR BUT NON-SLOTTED, THE FOUR CORNERS 12 OF WHICH ARE FOLDED ON THE UPPER SIDE OF THE COVER FOLLOWING BENDING LINES TAPED TO THE EDGES OF THE 10 SHEET PIECE LIFT LEGS 18.

Description

Lid made of sheet material for rectangular container

  and process for its manufacture.

  The invention relates to a cover made of sheet material to be crimped on all sides with rounded circumferential edge in the corners of a rectangular container, in particular a food tray. The invention further relates to a method for manufacturing such a lid.

  According to the German patent application NI 21 39 588, it is

  A thin-walled dish container is prepared, the aluminum foil lid having on the narrow sides of the hooking tabs which are folded over the upper face of the lid. To form the hooking tabs is part in the manufacture of this cover, a piece of rectangular sheet whose four corners are cut. The crimping zone of this known lid is further cut in four opposite places in pairs, the notches being connected two by two by fold lines. So we have to get that at the opening

  of the container, the hooking tabs, after

  may be bent upwards along the prefabricated fold lines, after which the lid shall be removed from the container in the plane of the lid itself, the edges of the two longitudinal sides of the container in front of the

serve as a guide.

  The known embodiment has the disadvantage that the piece of sheet must first be subjected to a cutting operation for forming the hooking tabs. It has furthermore been found that the crimps of the lid at both longitudinal edges are in most cases so tight by the edges of the container

  sliding of the lid like a drawer is difficult.

  cile, if not impossible. Such extraction of the lid also inevitably leads to the staining of the

  meal because food fragments stick to the inferior face

  lid and dripping during the removal process. The subject of German Patent Application No. 13 00 061 is a sheet material cover which is made from a piece of rectangular sheet. To form three tear-off tabs, the piece of paper is notched

  longitudinally on a narrow side before laying the cou-

  vial on the container, so that after crimping

  with the rim of the container on the upper face of the neck.

  verclese erect the three tear-off tabs by means of which the lid can be torn to open the container. Apart from the fact that this known lid must also be subjected to a cutting operation for its manufacture, it must be destroyed in order to open the container and it is never possible to prevent the sticky food fragments on the underside of the lid. born

  are projected by the reorientation forces.

  It is an object of the invention to provide a cover of sheet material of the type initially cut in such a way that it can be separated without destroying the container which it closes, without

  that, in this circumstance, there is a danger of

  by dripping food fragments, or projections

  liquid due to poor opening.

  This object is achieved according to the invention by virtue of the fact that the lid consists of a piece of sheet, known per se, substantially rectangular, but nevertheless not cut, the four corners of which, to form removal tabs, are folded over its upper side following lines of

  folding skewed compared to the edges of the piece of sheet.

  This solution considerably simplifies the opening of the lid without it being destroyed. In this case, it suffices for the opening to grasp the opposite corners

  to each other and pull them diagonally towards each other.

  to be released, by regular lifting, the edge of the lid crimped below the rim of the container, until this lid is separated from the container and can be

evacuated from above.

  The object of the invention is furthermore achieved by a method of manufacturing such a lid, which consists in that, with a piece of sheet that is not cut and substantially rectangular, its four corners are first folded on its upper face. following fold lines that are biased by

  to the edge of the piece of paper and that one then constitutes

  if lifting legs, following which, a

  in itself and forming rounded corners,

  bend the marginal area down.

  This method has the advantage over known methods of manufacture, that during the processing of the piece of sheet no cutting operation is necessary and there is no waste because the corners are not cut but folded and used in this state as lifting lugs. The bend of the corners also avoids an accumulation of disadvantageous material in the corner area during crimping of the edges. To that

  In addition, it has the advantage that no tongue of

  extra time is no longer needed to be folded

  on the upper side of the lid, so that a

  Tif folding significantly simpler and less expensive

enough for the manufacture.

  An embodiment of the invention will now be described, by way of example, in conjunction with the accompanying drawing, in which Fig. 1 is a plan view of a rectangular sheet of sheet material suitable for the manufacture of a cover according to the invention;

  Figure 2 shows the next work step for folding.

  four corners on the container shown below; Figures 3a and 3b show a side view and a view

  in plan of a container closed by a lid according to the invention.

  tion; and Figures 4a and 4b are corresponding representations

of the container when opening.

  FIG. 1 shows a piece of aluminum foil, rectangular and notched at any point, from which

  must be made the lid according to the invention.

  In the manufacturing step shown in Figure 2, the four corners 12 of the piece of sheet 10 are folded on the upper face of the piece of sheet 10 following fold lines 14 which are oblique with respect to the edges 16 of the

  piece 10. In this way, legs of

lift 18 at the four corners 12.

  In a second manufacturing step, the marginal zone 20 of the cover 22 manufactured in accordance with FIG. 2 is bent or folded downwards forming rounded corners 24, the cover 22 being ready for use to close off

a container 26.

  Figures 3a and 3b show the attachment of such a lid

  22 on an aluminum container, for example, a barker.

  you food. A flange 28, also rounded at the corners, surrounds the upper face of the container 26. The marginal area

  of the cover 22 is folded on this flange 28.

  To open the container 26 and to release the lid 22 thereof, it is now sufficient to grip the legs of

  uprising 18 opposed two by two and draw them diagonally

  outwardly from the rim 28 of the container 26, to release them. The lifting lugs 18 are then first lifted substantially in the plane of the container outwards and then downwards until it is released.

  regularly the whole marginal area 20 of the

  22 folded below the rim 28. The lid 22 can

  then be raised up without difficulty and without

  struction. During the entire opening process, the container 26 remains motionless in its place. By lifting the lid 22 above the container 26, the fragments of

  contained products that stick to the underside of the cov-

  22 only drip into the container 26 and do not

therefore do not feel the place of the meal.

  As already stated, there is no waste for the manufacture of the cover 22 because the corners 12 of the rectangular piece of sheet 10 are folded over the upper face of the piece

  of leaf to form the lifting legs 18.

  The folded corners 12 furthermore have the advantage that, precisely in the corner regions of the container 26, in which the strongest wrinkling and thus the strongest formation of cannulas are formed, there is more material of the covering. him thanks

  multiple folding, and thus the seal is improved.

Claims (2)

Claims.   1. Cover made of sheet material to be crimped on all sides on a peripheral rim and rounded at the corners of a rectangular container, in particular a food tray, characterized in that the cover (22) consists of a piece of sheet (10) per se known, substantially rectangular but non-notched, whose four corners (12) are folded on the upper face of the lid along folding fold lines with respect to the edges of the piece of sheet (10) to constitute paws uprising (18).   A method of manufacturing a container lid according to claim 1, characterized in that, starting from a piece of sheet (10) substantially rectangular and not cut, the four corners (12) are first folded on the upper face of the lid along fold lines (14) biased with respect to the edges (16) of the piece of sheet (10), thereby forming lifting lugs (18), after which folding in known manner into the zone   marginal (20) downwardly forming rounded corners (24).