FR2563187A1 - COMBINED BOX - Google Patents

Abstract

A COMBINED BOX 1 IS COMPOSED OF A MULTI-LAYER BODY 2 INCLUDING AN INTERNAL COVER 4 FUSE AND GAS-TIGHT, A BOTTOM 5 WHICH CLOSES IT AT ITS END AND A PART PARTLY METALLIC COVER 6 WHICH INCLUDES A COVERING PIECE RIGID 9 CRIMPED AT THE OPPOSITE END OF THE BODY AND EQUIPPED WITH AN OPENING 11, AND ON ITS INTERNAL FACE A FUSIBLE COATING 10 PRESENTING AN AFFINITY FOR THE INTERNAL COATING OF THE BODY, WHICH IS THERMALLY SEALED TO THE INTERNAL COATING OF THE BODY WHEN FITTING IN PLACE OF THE COVERING PART ON THE BODY, THE OPENING OF THE COVERING PART BEING COVERED BY A BLOCKING MEMBRANE FIXED TO THE COVERING PART BY GLUING OR SEALING AND PRESENTING AN ELASTIC CONFIGURATION OR BEING PREFORMED AS FOLLOWS SHAPE CHANGE, AFTER CLOSING, THE PRESSURE DIFFERENCES THAT APPEAR BETWEEN THE INSIDE AND THE OUTSIDE.

Description

Bolte combined.

  The invention relates to a combination box constituted by a multilayer body provided with an internal gas-tight and fusible coating, a bottom closing the latter at its end and a partially metallic cover, formed by a rigid covering piece provided with an opening, set at the opposite end of the body, and by a covering membrane covering

  this opening, fixed by gluing or sealing.

  Combined boxes of this kind are known (German patent

  1,814,951). They have the advantage of allowing -

  easy removal of the sealing membrane using a tear-off tab, so that no special tool is needed to open the box. A disadvantage is however that the cover piece crimped to the body which,

  in this case, with the configuration of a narrow ring comprising

  as long as an external crimping edge does not provide a

  gas tight, so such combination boxes are only suitable for rare applications. They cannot in particular be used for products for which the entry of oxygen must be prevented even on a

long period.

  Combined boxes are also known (German patent application 32 05 012) in which a stamped cover is also crimped there at the extreme edge of the body. The cover is provided on its internal face with a synthetic coating, which

  is thermally sealed to the internal coating of the body during

  before or after crimping. It is thus possible to obtain a gas-tight combined boot. There is however this drawback which one cannot condition in such combined boxes

  products that produce temporarily or permanently

  te an overpressure or a depression or who need it for their conservation. This applies in particular to products which are hot packaged or which contain

  dissolved gases, such as carbonated drinks.

  The differences in pressure must then be assumed by the material of the body of the box, which most often leads to deformation of the body and also requires strong

wall thicknesses.

  Finally, it is known to use the closure described above.

  above in connection with metal boxes, the ring

  of the cover being crimped onto the metal body with inter-

  position of a special sealing material. This process cannot be used for combination boxes. In addition, great care must be taken in the connection

  to obtain the desired gas tightness.

  The object of the invention is to improve the tightness of the

  combined boot defined above and in particular to obtain

  nir gas-tight embodiment, This object is achieved according to the invention in that the covering part is provided on its internal face with a fusible coating having an affinity for the internal coating of the body, which is thermally sealed to the internal coating of the body when the covering part is placed on the body, and the obturation membrane is configured

  or preforms so as to follow by change it forms

  these pressure between the inside and the outside which

occur after the obturation.

  It is possible, thanks to the coating of the ring of the cover.

  key with an affinity for the internal coating of the

  body, seal it and, therefore, the entire neck

  circle, to the body so as to create a gas-tight and pressure-tight connection between the fixed covering part and the body. Pressure resistance and tightness can be obtained in the region between the sealing membrane and the cover in the same way

  by a corresponding coating and a sealing thereof.

  This provision alone would not be sufficient to be able to pack in such a combined box products which are conditioned under vacuum or overpressure

  or who experience a pressure drop after conditioning

  is lying. The body of the box, if it has an admissible wall thickness for reasons of cost and weight, is

  would distort under the pressure difference. The invention

  weld this problem by providing further that the sealing membrane has an elastic configuration or is preformed so as to be able to withstand this pressure difference without damage to the body. Practical tests have shown that both pressure-generating products, such as carbonated drinks or the like, as well as products which must be vacuum-packed or which create such a vacuum, for example peanuts, can be packaged

  no problem in such a combination box. Conditions it

  hot products such as fruit and vegetable juices, jams, etc. is also possible despite

  the resulting increased stress on the can body.

  According to a preferred embodiment of the invention, the base is formed by a metal plate having a crimping edge and is provided on its internal face with a coating having an affinity for the internal coating of the body, which is sealed thermally to the inner lining of the body

  when placing the bottom on it.

  This embodiment offers for closing the bottom side a technique essentially similar to that of closing the lid, from which there results a rational manufacture of the packaging both in terms of the coatings used and in the closing technique, and gas tightness is further improved. The body can, in the usual way, consist of one or more layers of paper or cardboard linked together, the internal layer carrying the coating. Combined boots with such a body are distinguished by

advantageous manufacturing costs.

  The body is preferably made by the bobbin process.

  longitudinal swimming, its lap joint extending

  lon a generator. A body thus produced has the advantage

  relative to a helically wound body with a straight joint

  defined line, which is formed only after shaping the body. The joint is also shorter and therefore less expensive to form than in a helically wound body, the joint extending in the form of a helix must also be formed during its shaping. With a body wound longitudinally, due to the defined straight joint, which

  is no longer subjected to deformation forces, we can pro-

  yield to gas-tight welding later and therefore

  safer. In addition, it is also possible to manufacture in a realization

  tightness of the combined boxes having a cross-section

  cross-section of non-circular shape.

  According to an exemplary embodiment of the invention, the covering part has an annular configuration and a tongue

  is torn off on the sealing membrane,

  means of which the combined boot is opened to remove

its content.

  The tear-off tab can be connected to the periphery of the obturation membrane, for complete tearing, or else connected to the obturation membrane via

  thinned places, for partial tearing.

  Instead of the aforementioned exemplary embodiment, in which the rigid covering part has a circular configuration, it can also be provided that the opening of the covering part is arranged eccentrically as a filling opening and / or opening to drink, and the membrane

  shutter is formed by a tear-off tab covered

opening.

  This exemplary embodiment is particularly suitable for the packaging of liquid products, such as drinks or the like, in particular also for drinks.

  under pressure, for example carbonated drinks. The LAN-

  tear-off point forming the obturation membrane here has a smaller free cross-section than in the embodiment indicated above, but can all

  as well yield within the limits necessary for fluctua-

  pressure. In a preferred variant of this embodiment, the covering of the internal face of the covering part is stretched over the opening and the tear-off tab provided with an appropriate internal covering is sealed there. The internal coating can for example be placed on the covering part after cutting of

the opening.

  In this embodiment, the coating of the internal face of

  the covering piece and the internal coating of the lan-

  peeking pegs rest directly on each other in the region of the opening, so that they can be bonded to each other by sealing on all or part of their surfaces. This advantage is thus obtained at the same time

  that the coating of the internal face of the covering piece

  strictly covers the entire edge of the opening, so that it is protected against access by the product and

  that exchanges between the material of the covering part

  aent and the product cannot take place.

  If the covering part has only an annular configuration, it has a large central opening covered by the sealing membrane and the covering of

  the internal face of the covering part is advantageous-

  ment stretched on the edge of its opening to the outer face, while the sealing membrane is provided with a fusible coating having an affinity and is sealed

  thermally to the covering part by means of the latter.

  Thus, for the connection between the sealing membrane,

  ration and the covering part, in terms of technology and manufacturing technique, the same connection as between

  the cover piece and the body of the combination box.

  This connection can also be carried out without difficulty in a gas-tight manner. The internal coating of the covering part being stretched over the edge of the opening on its

  upper side, the edge of the opening is also overlapped here

  green, so that no exchange can take place between the

  cover material and product.

  According to an exemplary embodiment of the invention, the body

  also present on its external surface, at least in the re-

  part of its connection surface with the covering piece

  and, if necessary, the bottom, an external coating having an affinity for the coating of the covering part (and of the bottom), which is thermally sealed at

  these internal coatings during the fitting of the parts.

  In this exemplary embodiment, the sealing surface is enlarged in the region of the connection and the seal

  the closing gas is thus further improved.

  The invention will be better understood thanks to the description

  detailed given below of two exemplary embodiments, and in the accompanying drawings, in which: FIG. 1 is a partial longitudinal section of a first embodiment of the combination box; Figure 2 is a section similar to Figure 1 of a

  second embodiment of the combination box.

  The combined box 1 shown in Figures 1 and 2 has a body 2 in several layers made from layers of cardboard or paper bonded together, if necessary

  with the interposition of a metal sheet serving as a

  stop che. The manufacturing is preferably done by the longitudinal winding process, so that the body 2 is closed by means of a longitudinal joint 3 (Figure 2)

  which extends along a generatrix of the body.

  The body 2 has an internal coating 4 made of syn-

  aesthetic, which, on the one hand, fulfills the requirements in terms of food hygiene, and on the other hand forms a gas and liquid tight barrier layer vis-à-vis the

  multilayer body 2. The internal coating 4 is closed ther-

  only by sealing or welding according to the longitudinal joint

  dinal 3 after shaping the body.

  Combination box 1 is closed at one end by

  a bottom 5 and at its opposite end by a cover 6.

  In the exemplary embodiments shown, the bottom 5 is cons-

  formed by a stamped metal plate provided with a crimping edge 7. The bottom 5 is further provided on its face

  internal of a coating 8 made of a plastic material

  both an affinity for the coating 4 of the internal face of the body 2. The stamped metal plate is placed on the open end of the body 2 and linked to the latter by crimping the crimping edge 2 and the extreme edge of the body 2. At the same time or thereafter, the internal coating 4 of the body 2 and the internal coating 8 of the bottom 5 are sealed

thermally to each other.

  Two embodiments are given in Figures 1 and 2 for the configuration of the cover. In the embodiment according to FIG. 1, the cover 6 comprises a

  rigid covering piece 7 in the form of a covering ring

  truly, which here again has on its external face a crimping edge 17. The annular covering part 9 is provided with an internal coating 10, also constituted by a plastic material having an affinity for the coating 4 of the internal face of the body 2. The rigid covering part 9 also has an opening 11 of relatively large cross section, which is covered by a sealing membrane 12. The sealing membrane 12 preferably consists of a metal sheet

  13, which is here again provided on its internal face with a coating

  plastic. The closure membrane 12 is provided in this embodiment with a tear-off tab 15, which is for example formed on the closure membrane 12

by an appropriate cut.

  In the embodiment according to FIG. 1, the covering 10 of the internal face of the covering part 9 is stretched above the edge of the opening 11 on the external face of the covering part. The edge of the sealing membrane therefore rests by its internal coating 14 on the coating

  located outside the cover 9.

  For closing the cover 6, the crimping edge 17, in the same way as for the bottom 5, is crimped with the end edge of the body 2 and the coverings 4 and 10 are heat sealed to each other . Likewise, the coating

  internal 14 of the sealing membrane 12 is thermally linked

  ment to the covering 10 located outside the part of

recovery 9.

  The sealing membrane 12 has an elastic configuration or is slightly preformed so as to be able to yield to

  a depression or overpressure existing after the condi-

  operation, as shown in broken lines. The box

  closed handset 1 opens by pulling on the rear tab

  chage 15, which frees the entire cross-section

  dirty from opening 11, so the product can be

  poured or otherwise withdrawn.

  In the exemplary embodiment according to FIG. 2, the cover

  6 has another configuration. It includes a covering piece

  really 9 provided with a filling opening or opening

  for drinking which is smaller and offset. The piece of re-

  rigid cover 9 here again includes an internal covering and a crimping edge 17. The covering part 9 is fixed to the body 2 in the same way as in the embodiment according to FIG. 1. Unlike that here, the opening 16 is covered by a closure membrane 18 having the configuration of a tear-off tab 19. The closure membrane 18 has on its internal face a coating 20 constituted by a plastic material having an affinity for the internal coating of the cover piece. The coating 10, in this embodiment, is stretched like a film over the opening

  16 in region 21, so as to cover the edge of the ou-

  verture of the covering part 9. The internal coating of the closure membrane 18 and the region 21 forming a film of the internal coating 10 of the covering part 9 are in direct mutual contact, so that they can be

  heat sealed to each other in a simple manner.

Claims (12)

Claims.   1. Combined box consisting of a multilayer body provided with an internal gas-tight and fusible coating, a bottom closing the latter at its end and a partially metallic cover, formed by a rigid covering part provided with an opening , crimped at the opposite end of the body, and by a sealing membrane covering this opening, fixed by gluing or sealing, characterized in that the covering part (6, 9) is provided on its internal face with a coating (10) fuse with an affinity for   the internal coating (4) of the body (2), which is thermally sealed   mically to the internal coating (4) of the body (2) during the positioning of the covering part (9) on the body (2), and that the sealing membrane (12, 18) is configured   or preformed so as to follow by change of form the different   these pressures between inside and outside occur health after obturation.   2. Combined box according to claim 1, characterized in   that the bottom (5) is formed by a metallic plate   carrying a crimped edge (7) and is provided, on its internal face,   a coating (8) having an affinity for the coating   internal layer (4) of the body (2), which is heat sealed to the internal coating (4) of the body (2) when place the bottom (5) thereon.   3. Combined boot according to one of claims 1 and 2,   characterized in that the body (2) consists of one or more layers of paper or cardboard linked together,   the internal layer carrying the internal coating (4).   4. Combined boot according to one of claims 1 to 3,   characterized in that the body (2) is produced by a   longitudinal winding process and that its re-   cover (3) extends along a generator, 1 1   5. Combined box according to one of claims 1 to 4,   characterized in that the covering part (9) has an annular configuration and that a tear-off tab (15)   and disposed on the sealing membrane (12).   6. Combined box according to one of claims 1 to 5,   characterized in that the tear-off tab (15) is arranged at the periphery of the closure membrane (12) for a complete tear.   7. Combined box according to one of claims 1 to 6,   characterized in that the tear-off tab (15) is linked to the sealing membrane (12) via   thinned places for partial tearing.   8. Combined box according to one of claims 1 to 4,   characterized in that the opening (16) of the workpiece   cover (9) is arranged eccentrically as an opening   filling and / or as an opening for drinking, and   that the sealing membrane (18) is formed by a lan-   tear-out (19) covering the opening (16).   9. Combination box according to claim 8, characterized in that the internal coating (10, 21) of the covering part (9) is stretched like a film over the opening (16) and that the tear-off tab (19 , 18) fitted with a   appropriate internal coating (20) is sealed there.   10. Combination box according to claim 9, characterized in that the internal coating (10) is placed on   the cover piece (9) after cutting the opening ture (16).   11. Combined box according to one of claims 1 to 16,   characterized in that the internal covering (10) of the covering part (9) is stretched over the edge of its opening (11) up to the external face, and that the sealing membrane (12) is provided a fusible coating (14) having an affinity by which it is sealed   thermally to the covering part (9).   12. Combined box according to one of claims 1 to 11,   characterized in that the body (2) also has on its external face less in the region of its connection surface with the covering part (9) and, where appropriate, with the bottom (5), an external coating having a affinity with the coating of these, which is thermally sealed to the internal coating (10, 8) of the covering part (9) (and of the bottom (5)) during installation   of it (of these) on the body (2).