FR2505774A1 - PROCESS AND INSTALLATION FOR PACKAGING GOODS - Google Patents

Abstract

PROCESS AND INSTALLATION FOR PACKING GOODS. IN THE WELDING STATION OF THE INSTALLATION, BELOW THE SHEETS 2, 9, THE WELDING ELEMENTS 10, 13, THE LONGITUDINAL WELDING ELEMENTS 10 OF LENGTH LONGER THAN THAT OF THE PACKAGING 7 ARE PROVIDED OVER THE WIDTH OF THE SHEETS, PARALLELY TO THEIR SIDE EDGE, WHILE THE TRANSVERSE WELDING ELEMENTS 13 ARE ARRANGED PERPENDICULARLY TO THE SIDE EDGES OF THE SHEETS 2, 9 AND MAY SLIDE IN THE LONGITUDINAL DIRECTION. PACKAGING OF GOODS.

Description

The present invention relates to a method and an installation for

  packing goods between two sheets in which a cup is formed in a sheet, the goods are placed in the cup and then sealed by welding the edge of the cup with a second sheet. In known processes and installations of this type, the welding is carried out by means of a welding frame which is generally provided with an aluminum plate having

  transverse and longitudinal ribs

  depending on the formats In the tray are heating bars or heating pads that

  give heat to the aluminum tray through

  of a temperature sensor and a thermostat.

  The longitudinal and transverse ribs, through which heat is transferred to the leaves are

  warmed by the aluminum tray.

  A package is welded normally at the edges by two transverse weld seams and two strings of

  longitudinal weld, with the possibility of weld-

  In this case, the packaging

  welding head which is required carries several longitudinal and transverse welding ribs as a function of

the size of the packaging.

  The welding plate is placed above the two sheets to be welded, while underneath the sheets

  there is a chamber with corresponding bars

  the layout and width of weld seams

  or transverse and longitudinal welding ribs.

  To carry out the welding, the chamber is lifted by a lifting device and then the welding plate is lowered by a pneumatic device. The sheets are thus pressed together and, by the transmitted heat of the

  soldering plate, are brought to the temperature

  of fusion, thanks to which they are welded together to

the other.

  This classic device necessarily has a

  number of serious disadvantages.

  That's how it turned out that he's very

  difficult to obtain an even distribution of heat.

  The differences in temperature are partly so great

  in welding, a portion of the weld seams to be made is not welded, while another part is burned due to overheating.

  In packages matching the contours of the pro-

  duit, for which the upper sheet is constituted

  of a cardboard, it is necessary to work at a temperature of

  excessive age and durations

  to obtain the required welding temperature

  between the two sheets, so that it occurs,

  work, energy losses and losses of

additional time.

  In addition, depending on the number and size of

  soldering ballasts, a greater or lesser surface area of the weld seam is obtained As the pneumatically driven welding plate is always driven with the same force, regardless of the surface of the weld seam, this causes significant differences in the specific surface pressure. so that's not enough

  often to get a perfect welding.

  Finally, when using the machine, it is necessary to use a different welding plate and a different welding chamber for each dimension of the package, which entails, in addition to significant preparation times, significant additional costs. provision and storage. Given this state of the art, the invention proposes, while avoiding the mentioned disadvantages of the method and the installation of the type mentioned above, to make possible a uniform and faster welding without

  run the danger of overheating the leaves.

  The process according to the invention is characterized in that

  that it consists of bringing down the weld

  to form welding elements between or beside

  cups spread across the width of the leaves and forming

  the lower leaf and the upper leaf

  welding gift, which has at least the length of the package,

3 2505774

  then forming, with a welding element brought from below, at the end of the buckets, considered in the direction of advance of the sheets, a transverse weld bead,

  which extends over the entire width of the leaves.

  The installation according to the invention comprises a pos-

  deep drawing to form scoops

  in a ribbon of sheet, a loading station for placing the goods in the buckets, and a welding station in which the edge of the bucket previously formed in the lower sheet can be welded under pressure and under the action of the heat with the upper leaf and is characterized in that, beneath the leaves, are

  arranged welding elements, which are intended for

  longitudinal and transverse welding

  sliding in the vertical direction, longitudinal welding elements of length equal to or greater than those of the packages being arranged, with the possibility of

  depending on the number of longitudinal weld seams

  dinals necessary, over the width of the sheets parallel-

  side edge of the leaves, while the elements

  transverse welding machines arranged substantially perpendicularly

  at the lateral edges of the leaves can slide in the longitudinal direction of

  In this way, in addition to a large number of

  important, a possibility of universal use of

  the packing machine We can share, in a simple way

  the width of the sheets according to the desired size for the package, practically at will, without the need to exchange the welding frame by a process

  taking time It is possible to adapt practically, in a

  re continues, the transverse welding As the welding elements are brought from below, it is no longer necessary to work at high heating temperatures furthermore

  long periods of time for packaging

  This is a uniform weld bead because the welding elements

  on the sheet, from the bottom, have substantially the same temperature

  Thus, it can not occur overheating of the sheet, even in the case of

  repeated welds Finally, in the installation following the in-

  vention one can dispense with the whole device for

  the lowering of the welding frame, which reduces

  significantly reduce the manufacturing costs of the installation. According to the invention, therefore, neither the welding frame which depends on the format, nor the

  Welding die that depended on the format.

  Preferably, the welding elements are arranged

  in elements to be plugged in, both an attachment by complementa-

  form of an electrical connection for the heating element arranged inside the welding element

  being made by plugging into selective positions.

  According to a preferred embodiment, the length of the transverse welding elements is equal to that of the longitudinal welding elements. As a result, the welding elements can be exchanged, which leads to a simplification of the manipulations and other advantages.

costs.

  Advantageously, the width of the welding elements

  is twice that of a longitudinal weld seam

  dinal or transverse, so as to obtain a usual weld bead width after a separation in the middle

after welding.

  Preferably, the height of the welding rails is such that they can receive substantially only one element

  of heating, as well as a temperature sensor.

  therefore, there is only a small mass to heat, which

  makes it possible to obtain a uniform welding temperature on the rails, avoids overheating of another zone of the packaging and saves energy At the same time, there is no problem of accumulation of heat in the middle areas of the welding frame, as was

  current in the usual installations of this type.

  Preferably, the welding rail is separated from its support by means of an insulating plate. Below the support of the welding elements are elastic elements for the application of the welding pressure, these elastic elements being able to be They consist of springs, rubber, or piston and cylinder units. It is thus certain that the welding element always presses with the same pressure force on the sheets to be welded. This results in a uniformly uniform surface pressure, independently. the size of the packaging, which ensures

  good quality and uniform weld seams.

  By covering both sides of the welding elements

  insulation boards according to another method of

  preferred embodiment of the installation according to the invention,

  gets additional protection from the marginal regions

  the packaging against overheating.

  Other advantages and features of the invention

  will emerge from the following description of

  preferred embodiments with reference to the accompanying drawings in which:

  FIG. 1 is a schematic side view of the

  according to the invention incorporated in a machine of

  packing for; Figure 2 is a view of the longitudinal welding member and counter pressure plate opposite it, according to one embodiment of the invention; Figure 3 is a view corresponding to Figure 2 of another embodiment of the invention; Figure 4 is a view of a transverse welding element according to the invention; and FIG. 5 is a sectional view-following a plane

vertical of a welding element.

  The embossing machine Irepresented schematically in FIG. 1, comprises a deep drawing station in which the goods receiving buckets are formed in the lower sheet, a loading station for placing the goods in the buckets, a welding station in which the upper sheet is welded to the lower sheet by closing the cups, and a cutting station in which the packages are separated

one another.

  The lower sheet 2, ribbon-shaped, is unwound from a rotatably mounted feed reel 1 and

  is sent to the stamping station. For this purpose, it does not

  first between a top heating plate 5 before

  lable and a lower preheating plate 6, which brings it to the softening temperature. The stamping die 3 is maintained at the same time as the preheating lower plate 6 on rails 4.

  hoist slidable in the vertical direction.

  During step-by-step progress of sheet 2

  lower, a section of the leaf between the

  5 and 6 preheating is heated, while

  the previous section is transformed by a matrix of

  stuffing, in a bucket or in several buckets juxtaposed.

  The open buckets 7 are then sent to the load station-

  in which the goods are placed in the buckets.

  At the loading station follows the position of

  of the packing machine which is more

  object of the invention In the welding machine

  feeds the upper sheet 9 of a feed reel 8

  rotation and bring the bottom sheet 2 upwards. In addition, in the region of the welding station are provided, beneath sheets 2 and 9, rails 12 of

  which can slide in the vertical direction

  The lifting rails bear, on the one hand, the elements

  13 transverse welds, as well as a

  plate 26 serving as a support for the welding elements 10

  above the leaves 2 and 9 a plateau 11 of

  counter-pressure faces the longitudinal welding elements 10

titudinal.

  Cross-sectional views along a vertical plane of the

  The support 26 of the longitudinal welding elements 10 and the counter-pressure plate 11, in accordance with various embodiments of the invention, are shown in FIGS. 2 and 3. The welding elements 10

  longitudinal elements are arranged in plug-in elements which can

  may be driven into holes 27 formed in the support plate 26 The holes 27 are formed in the plate 26

  support so that a longitudinal welding element 10 is

  dinal can be inserted between or beside each packaging

  depending on the distribution of the total width of the sheet between the different widths of the packages.

  the embodiment according to FIG. 2, four packings

  They are provided side by side along the width of the sheet, whereas in the embodiment according to FIG. 3 there are only two packages side by side across the width of the sheet. The holes 27 may be such, for example, for example, it is possible to simultaneously weld up to six juxtaposed packings along the width of the sheet When the width of the packs changes, it is simply necessary to modify accordingly the insertion of the elements 10 of

longitudinal welding.

  As can be seen from FIGS. 1 to 3, a counter-pressure plate 11 is opposite the longitudinal welding elements, with profiled strips 24 being arranged

  in the embodiment according to FIG.

  counter-pressure plate in correspondence with the position of the holes 27 drilled in the plate 26

  Thus, regardless of the plug-in configuration

  longitudinal welding elements 10, a rod

  24 profile for welding faces them respectively.

  In the embodiment shown in FIG. 3, the underside of the counter-pressure plate 11 is provided with a rubber coating. Here too, therefore, it is possible to

  perform the welding without problems, whatever the

  inserting figure of the longitudinal welding elements 10

Dinaux.

  The transverse welding elements 13 are mounted on the lifting rails 12 following the support plate 26 in the direction of advance of the sheets 2 and 9. The transverse welding elements 13 are also arranged as plug-in elements and preferably have , the length of the longitudinal welding elements 10, so that they can be exchanged with them The position of the transverse welding elements 13 on the lifting rails 12 can

8 2505774

  be modified according to the direction of progress of the

  the, so that we can reconcile this position

  without problems to the lengths of packaging As the

  4, transverse welding elements 13 are plugged into a support rail 28 which is in turn held by the lifting rails 12. Opposite the transverse welding elements 13 are, above the sheets, rails 29 of against. -pressure with sticks 30

  profiles for the realization of the trans-

  versal An essential advantage of the following arrangement

  the invention is that, thanks to the individual adjustment of the ele-

  transverse welding, it is possible to align the upper sheet 9 on the lower sheet 2,

  that for this purpose an expensive adjustment device was necessary.

  in the usual facilities of this type.

  The constitution of the ext welding elements explains

  mentioned below, with reference to FIG. 5 The welding elements and 13 comprise a welded rail 17 whose height is exactly such that they can not receive

  that a heating element 19 as well as a temperature sensor 20

  This keeps the mass to be heated at a low value, which translates into low consumption.

  because of the minimal dissipation of heat

  and the ability to adjust the temperature to equal values The welding rails 17 are carried by a

  support 18, an insulating plate 21 being interposed between

  the support 18 and the welding rail 17 in order to minimize

  heat dissipation on both sides of the element

  welding rods 22 are insulating

  as well as the welding rail 17 and the support 19 and preventing an undesirable heat transfer on the side faces of the container. The welding elements are held by bolts 31, against the pressure

  elastic elements, such as compression springs 23.

  This ensures a still constant pressure of the welding rails on the back pressure plate or on the back pressure rails.

  back pressure can also be replaced by rubber

  rubber or by piston and cylinder units.

  Referring to FIG. 1, the containers which have been welded in the meantime are fed to a cross-sectional device 14, as well as to a longitudinal cutting device, by means of which the containers are detached from the sheet. The containers are sent then by a strip 16 for evacuation to a subsequent treatment, such as for example the introduction into larger containers.

  As is clear from the above description

  In accordance with the invention, it is not possible to dispense not only with the setting up, which is usually necessary, of a welding frame adapted to the size of the package, with the drive device of its own. but we also get welding seams of a good quality

better and more uniform.

Claims (15)

  A method for packing goods between two sheets, wherein a cup is formed in a sheet, the goods are placed in the cup and then sealed by welding the edge of the cup with a second sheet, characterized in that consists of bringing down from the bottom on the weld bead to form welding elements between or beside the buckets distributed over the width of the sheets and to form between the lower sheet and the upper sheet a weld bead, which has at least the length of the package, then to form, with an element of   welding from below, at the ends of the buckets, considering   following the direction of advance of the leaves, a cor-   transverse welding gift, which extends across the width leaves.   An installation for carrying out the process of claim 1, comprising a deep drawing station for forming merchandise buckets in a ribbon ribbon.   sheet, a loading station to place the goods   its in the buckets, as well as a welding station in the-   which the edge of the bucket formed beforehand in the sheet   can be welded under pressure and under the action of heat with the topsheet, characterized in that   that, below the leaves (2,9) are arranged 16   weldments (10, 13) which are intended for   longitudinal and transverse welds and which can   in the vertical direction, longitudinal welding elements (10) of equal or greater length than the packages (7) being arranged, with the possibility of change, according to the number of welding beads   lengthwise, along the width of the parallel sheets   same side edge of the sheets (2, 9), while the transverse welding elements (13) arranged substantially perpendicular to the lateral edges of the sheets (2, 9), can slide in the longitudinal direction of the advancement of the leaves.   3 Installation according to claim 2, characterized   characterized in that the elements (10, 13) of welding are 2505774 arranged in plug-in elements, both a form-fitting fastening and an electrical connection for   the heating element (19) disposed within the element   welding (10, 13) being performed by plugging into selective positions. 4 Installation according to claim 2 or 3, characterized in that the length of the transverse welding elements (13) is equal to that of the elements (10) of longitudinal welding.   5 Installation according to one of claims 2   to 4, characterized in that the width of the welding elements (10, 13) is twice that of a bead of   longitudinal or transverse weld.   6 Installation according to one of claims 2   5, characterized in that the elements (10, 13) of welding   ge consist of welding rails (17) held on a support (18), the welding rails (17) being separated from   their support (18) by an insulating plate (21).   7 Installation according to one of claims 2   at 6, characterized in that the height of the welding rails (17) is such that they can receive substantially only a heating element (19) and a probe (20) temperature.   8 Installation according to one of claims 2   7, characterized in that the two sides of the welding elements (10, 13) are covered with insulating balls (22).   9 Installation according to one of claims 2   to 8, characterized in that below the support (18) welding elements (10, 13) are arranged elements   (23) elastics for the application of the welding pressure.   Installation according to claim 9, characterized   characterized in that the elastic elements are constituted compression springs.   11 Apparatus according to claim 9, characterized   characterized in that the elastic members are of rubber.   12 Apparatus according to claim 9, characterized   characterized in that the elastic elements are constituted 12 2505774   respectively piston and cylinder units.   13 Installation according to one of the claims   2 to 12, characterized in that above the longitudinal welding elements (10) is arranged a counter-pressure plate (11).   14 Apparatus according to claim 13, characterized   characterized in that strips (24) profiled in rubber   rubber are mounted in the backing plate (11)   above the position of the welding elements (10).   Apparatus according to claim 13, characterized   characterized in that the counter-pressure plate (11) bears over the whole surface of its lower part a coating (25) rubber.