The sector covering the technique for this patent is the making of
packaging which is made up of wrapping items of great length.
Until recently certain products, especially extremely long ones,
were not wrapped, but instead transported exposed to the weather, held on trucks
or other forms of transport, and reached their destination depending on their
transport conditions; said products could be piping, beams, etc., designed for
resisting very different forms of damage by their very nature.
Nevertheless, there are a great number of products today which are
delicate and made with a kind of structure which cannot be transported without
wrapping, and furthermore there are no facilities for making said covering for
As regards the prior state of the art, the following machines for
making corrugated cardboard are known:
EP-A-0 418 364, for a procedure for making corrugated cardboard or
similar, EP-A-0 518 053 for a procedure for making printed corrugated cardboard
of great width, as well as the installation for developing the procedure, EP-A-0
498 777 and US-A-3 844 201 for a method for making containers of corrugated cardboard.
The aforementioned patents start from the making of furrowed card
to obtain the corrugated cardboard; nevertheless, due to the lack of need for making
pieces of great lengths no application of this process or similar is known of
with anything to do with the subject of this invention.
The aim of this invention is to provide a means for making packing
of great length, consisting of producing a folding line on the continuous strip
of corrugated cardboard by means of continuous linear pressure made in a continuous
fashion along the whole length of said cardboard belt.
Apart from producing the continuous folding lines on the continuous
strip of corrugated cardboard, a transverse perforation line is also made at regular
lengths, and coinciding with the already mentioned folding lines and in the zones
adjacent to each of the sides of each of the transverse perforation lines, provision
is made for making longitudinal cutting lines of a length which will normally be
suitable for making the closure at the ends of the packing after mounting.
The device for making the folding lines consists of a set of rollers
of which at least one has annular crowns superimposed on each other, in a fixed
or movable fashion, and the strip of corrugated cardboard is pulled along by means
of this device, and with the rollers placed so that the pressure of said crowns
on the surface of the cardboard does not cause tearing of the same. The crowns
can be fixed on the roller by clamps, screwing, sticking, or any other suitable
In the embodiment according to the invention, in which cyclical
perforation lines are also made, a blade with a cutting edge interrupted in places
is fitted on one of the rollers, and beside this, aligned on the cutting crowns,
there are longitudinal blades. The interval of the length between transverse cuts
can be predefined, with there being a control processor which would cyclically
set said cutting rollers in motion, according to instructions from the processor.
The continuous packaging strip of corrugated cardboard obtained by
said procedure and equipment consists of a continuous surface of corrugated cardboard
provided in a roll or coil, of a fixed width and previously indeterminable length,
in which there are longitudinal lines which, through the pressure exerted on the
crowns of the rollers - through having split the transverse furrows in the corrugated
cardboard, this thus being flat in said area - enables these to be folded, and
thus to make packaging items which are closed off by means of cutting the ends
and folding these inward.
The cardboard strip has transverse perforation lines at regular intervals
along its length, and adjacent to these and in continuity with the longitudinal
lines scored, cuts of a suitable length.
With the packing mounted, said longitudinal scores enable the areas
of corrugated cardboard between these to be folded like overlaps or flaps.
In order to make the explanation of the invention clearer, three
sheets of drawings are included which represent the essence of this invention in
Figure 1 shows a perspective view of the process.
Figure 2 shows a perspective view of an unfolded box obtained in
Figure 3 shows the structure of the groove in the corrugated cardboard.
Figure 4 represents a view of the strip of corrugated cardboard coming
out of the cutting rollers according to the invention.
Figure 5 represents a plan view of the strip of corrugated cardboard
perforated in accordance with the invention.
Figures 6 to 9 represent the ways the strips of corrugated cardboard
can be used in accordance with the invention.
In Figure 1 we can see, given the number 1, the roll of corrugated
cardboard, which, due to having the corrugated part joined to a piece of flat cardboard,
enables it to be stored on rolls; 2 indicates the upper traction roller, and 3
the lower traction roller, 4 being the lower support roller, and 5 the roller which
supports, for example, a flexography style stencil to allow continuous printing,
through an ink supply which starts at the rollers or at a supplier of the same
shown as 6. 7 shows the upper support roller, which is placed on the flat part
of the cardboard, and 8 is the roller whose alignment coincides with 7, which has
ridges 9 which can break into the cardboard, thus scoring this lengthways to make
the folding lines. 10 shows the flat side of the cardboard, and 11 the corrugated
side. 12 is the part which can form the box, 13 being the scoring lines and 14
the final parts of the scoring lines which after cutting will make the flanges
or wings which allow perpendicular closing of the box.
In the embodiment of the invention we can see in Figure 4 how the
corrugated cardboard strip 21, after treatment in the first embodiment, goes between
a pair of rollers which produce a transverse perforation line and longitudinal
As can be seen in Figures 4 and 5, 21 represents a continuous strip
of corrugated cardboard, with 22 being a transverse perforation line made on the
same, with a longitudinal scoring line 23 made in this, 29 being a closing flap
shown in Figure 6 and 13 being the scoring lines which mark the folding lines
for said strip of corrugated cardboard. 26 and 27 show a pair of rollers whose
function is to make the transverse perforation lines.
The method is based on the formation of longitudinal pieces that
can be severed in accordance with the size of the item to be wrapped of predetermined
length. It is not therefore necessary for the cardboard to have been severed beforehand,
but can instead be stored in rolls. The fact that the cardboard is corrugated enables
rolls to be formed without this being a disadvantage for the stiffness of the
boxed formed, since the formation of the boxes by folding, due to said angle, prevents
the flexibility which it has without folding. Roller 8 contains parts which, like
rings are set out at particular distances in order to form thereby a box of previously
known dimensions as regards the section. A triangle shape can be formed, as can
be deduced from the groove lines shown in Figure 1, as is indicated by the rings
9 of the same, as well as other geometrical forms, according to the position of
the rings on roller 8. To form the box, the continuous strip of cardboard is severed
at one of the perforation lines and folded to form a rigid structure, being fixed
by conventional forms of closure (sticking, stapling, taping, for example). The
printing of the continuous strip of corrugated cardboard can form part of the
One of the rollers 26 has a transverse blade 28 on its surface which
can make a perforation line 22 on the cardboard 21 also transversely on said strip
The roller that carries the transverse blade has a number of blades
24 located at the perimeter of the section of said roller, which in turn act on
the cardboard strip making longitudinal cuts perpendicular to the aforementioned
cutting line, and adjacent to the same.
The blades can be moveable along the roller by means of one or several
guides set there for this purpose, and have in turn securing means to prevent them
The length of each one of the longitudinal cuts will be the right
one for the particular dimensions and type of product to be packed.
The process, machine and corresponding strip of corrugated cardboard
described above can be made in parallel on several lines at the same time, with
the result being similar to that of a number of machines working in parallel,
but with separating longitudinal cutting means for each two of these.
This is for application in the manufacturing of rolls of corrugated
cardboard for making cardboard boxes.