Method for joint packaging of bags and their contents and machine for performing such method

Bags containing a particle, powder or granule product are packed inside a wrapper formed from an elongated laminar wrapping of thermo-bonding plastic. The wrapping is sealed along longitudinal seams to form a sleeve. The bags of product are advanced on a transporter and pressed to a compact and even shape. A first bag is placed on a temporary support and the wrapping formed into a sleeve about the bag. The first bag is allowed to fall into the sleeve. The sleeve and bag are caused to ascend at the same time, and the sleeve is closed with seams during its descent. The process is then repeated for successive bags until the sleeve contains a set number of bags. The sleeve is then closed into a welded wrapping about the bags.

I. FIELD OF THE INVENTION 
This invention relates to a method for performing joint packaging of bags 
and the contents thereof, and it also relates to the machine used to carry 
out said method. 
In the packaging industry, one of the most well known ways to sell powder 
and granule products is through fractioning and packaging in paper bags or 
plastic bags; the latter are preferred as they are stronger, more 
permeable and extremely airtight. However, as particle products and finely 
divided products behave in a similar way as liquids, because the laminar 
packaging is flexible, said package deforms because of the movement and 
weight of the contents. This is why large quantities are difficult to 
store, transport and handle. 
Therefore, it is necessary to provide the joint packaging of bags, this is 
generally done by means of boxes; said boxes can be used when selling to 
wholesalers, retailers and dealers of the bag-packaged products. 
The use of boxes is, no doubt, advantageous, though as cardboard is 
hygroscopic, oftentimes it causes decay of the goods as humidity may 
affect said goods. Moreover, cardboard is expensive, and it is advisable 
to use materials which are cheaper and more waterproof. 
For a long time, new methods and machines have been necessary for providing 
bags for special products in plastic bags; but many difficulties arose 
which even today make this kind of bag-packaging difficult, as for 
example, the deformation of the package itself, because of the movement of 
the contents thereof, the frailty of the bag walls so that it is not safe 
to use machines to handle them, etc. 
Thus, there are available tube-like plastic packages, closed at one end, 
which are manually loaded, whose other end is then closed in order to 
define the package. 
This process, apart from being slow and expensive, is complex since as bags 
are filled their shape and size change; so when they are filled manually, 
if the sleeve is tight, the bag folds produce an uneven bellows (which 
leads to conditioning), whereas if the sleeve is loose, the goods are not 
well conditioned and may break. 
The object of the present invention comprises a new packaging method for 
bags in a plastic laminar packaging, by means of the use of a completely 
automated, high-performing and safe machine, which helps reduce the 
remarkably high cost of the packaging methods, and improves production. 
Moreover, the resulting packaging defines more or less plane bottoms which 
make it possible for the package to stand, and therefore, they are easier 
to store in warehouses, deposits or means of transport. 
Also, the machines embodies two different versions of one concept: 
a) the transport of bags from the station or receiving area to the sleeve, 
is carried out through gravity (applicable, for example, to bags 
containing granule products or grains, such as rice, legumes etc.) and 
b) a controlled and gradual fall where each bag is taken by a mechanism, 
and then placed inside a packaging sleeve; the latter is appropiate when 
the bag contains liquids, such as milk or similar. 
For all the above mentioned reasons, it is easy to conclude that this 
invention will be welcomed once it is embodied, no matter its final use, 
since because of the features thereof, it can be used for packaging 
grains, particle materials such as sugar, corn flour, wheat flour, 
granules, gels, medicinal herbs, etc.

In these figures, same reference numerals indicate the same parts or 
corresponding parts, and the letters indicate sets of several elements. 
LIST OF PRINCI REFERENCES 
(a) transporter (FIGS. 1, 3, 4) 
(a') top bag presser (FIGS. 1, 3). 
(a") side bag presser (FIGS. 3, 5). 
(b) machine framework (FIGS. 1, 2, 6) 
(c) sheet wrapping spool (FIGS. 1, 2) 
(d) sleeve defining head (FIGS. 1, 2, 9A, 9B, 9C). 
(e) braking system (FIGS. 2, 5) 
(f) film guiding presser (FIG. 2) 
(g) piling guide (FIGS. 4, 5) 
(h) (d) driving mechanism 
(p) resulting package (FIGS. 9A, 9, 10) 
(H.sub.w) horizontal welding means (FIGS. 1, 2, 6, 7, 8, and 9A) 
(V.sub.w) vertical welding means (FIGS. 1, 2, 6, 9A, 9B, 9C) 
(1) (a) conveyor belt (FIGS. 1, 3) 
(1') roll transporter (variant of FIGS. 11 through 15) 
(2) (a') presser conveyor belt (FIGS. 1, 3, 4, 5) 
(3) side bag definers (FIGS. 3, 5) 
(3') corner elbows of (3) (variant of FIGS. 11 through 15) 
(4) swinging port (FIGS. 3, 4, 5) 
(4') hinging axis of (4) (FIGS. 3, 4, 5) 
(4") side pushing members (variant of FIGS. 11 through 15). 
(5) electric eye (FIGS. 1, 3, 4, 5). 
(5') sensor (variant of FIGS. 11 through 15) 
(6) pressing fluid driving circuits (FIGS. 4, 5). 
(7) engine (FIG. 5). 
(8) bottom welding bar for bottom wall (FIG. 7) (22) 
(8') welding bar of head sheet walls (23) (FIG. 7) 
(9) bar guiding wall for clamp holder bar (FIGS. 1, 2, 6, 9A, 9B, 9C) (11) 
(10) tracking bars of the horizontal welding framework (H.sub.w) (FIGS. 2, 
6). 
(11) clamp holder bar (FIGS. 2, 6, 7, 8, 9A, 9B, 9C) 
(12) horizontal welding bar (H.sub.w) (FIGS. 2, 7, 8) 
(12') horizontal welding counterclamp (H.sub.w) (FIGS. 7, 8) 
(13) stretching supports in clamp (12) (FIG. 7) 
(13') rigid anti-sliding counter supports of counter clamp (12') (FIG. 7) 
(14) cutting blade separating the resulting packages (p) (FIGS. 7, 8) 
(14') blade inlet in counter clamp (12') (FIGS. 1, 2, 3, 9A, 9B, 9C) 
(15) regulating screw and welding/cutting clamp fitting (FIGS. 7, 8) 
(16) hood defining of sleeve head (d) (FIGS. 7, 8) 
(17) guiding roll of the wrapping sheet (20) (FIG. 2) 
(18) mobile pressing jaw of film guilding presser (f) (FIGS. 1, 2) 
(18') fixed rotating jaw facing mobile pressing jaw (18), of the presser 
(f) (FIG. 2) 
(19) jointed arm, holder of mobile pressing jaw (18) (FIGS. 2, 9A, 9B, 9C) 
(19') fixed arm of presser film presser (f) (FIGS. 9A, 9B, 9C). 
(20) wrapping sheet (sleeve-like shaped) (FIGS. 6, 9A, 9B, 9C, 10) 
(20') axis of spool (FIG. 9A) (c) 
(21) displacement columns of the vertical welding system (V.sub.w) (FIG. 2) 
(22) sheet wall of the wrapping bottom (FIGS. 9A, 9B, 9C, 10) 
(22') cross-sectional welding of wrapping (22) (FIGS. 9A, 9B, 9C, 10) 
(23) head sheet wall of the wrapping (FIGS. 9A, 10) (22) 
(23') cross-sectional welding of wall (23) (FIG. 10) 
(24) longitudinal edges of the wrapping sheet (FIG. 10) 
(24') cross-sectional discontinued seams of edges (24) (FIG. 10) 
(25.sub.a) first package bag. (FIGS. 3, 9A, 9B, 10) 
(25.sub.b) second package bag (FIGS. 3, 9A, 9B, 10) 
(25.sub.n) last package bag. (FIGS. 9A, 9C, 10) 
(25') contents of the bag (granules, powders, etc.) 
(26) blower-shaper of the side bellows in the wrapper (FIGS. 1, 2, 6) 
(27) package holder braking mechanism (FIG. 2) 
(28) driving command of temporary support (FIG. 5) (30) 
(29) reception bag box (FIG. 4) 
(29') rigid tube aligned with bag box (29) (FIGS. 2, 9A, 9B, 9C) 
(30) opening floor or temporary support of the bag in spool (c) (FIGS. 3, 
4, 5) 
(31) vertical welding jaws (FIGS. 9A, 9B, 9C) 
(32) command keyboard (FIG. 1) 
(33) frame supports in frame work (b) (FIG. 2) 
(34) floor driving mechanism for support (30) (FIGS. 4, 5) 
(35) upward-downward pin, clamping head holder of each bag 
(variant of FIGS. 11 through 15) 
(36) guiding columns-support of pin (35) (variant of FIGS. 11 
through 15) 
(36') bag holding head (support) (variant of FIGS. 11 through 15) 
(37) bag holding head (variant of FIGS. 11 through 15) 
(38) holding clamps in head (37) (variant of FIGS. 11 through 15) 
III. MAIN OBJECT 
According to the stated objects, the new method for the joint wrapping of 
bags (25) and the contents thereof (25'), is that in which bags (25), 
filled with a product (25'), either granule or powder product, form a pile 
inside a sheet, elongated wrapping (20), made of thermo-bonding plastic, 
whose longitudinal edges (24) define a sleeve, and which comprises a 
closed bottom (22) and a closed sheet head wall (23), by means of welded 
seams (22 and (23"); said method is characterized in that it comprises the 
following steps: 
advancing the bags (25) lying on the transporter (a) in such a way that 
they are pressed evenly without exceeding the maximum volume of the 
contents thereof (25'); 
providing the first bag (25) over a temporary support (30) thereof; 
partially defining the continuous sleeve-like sheet wrapping (20) around 
and under the bag (25a) with a welded bottom (22) (22'); 
deactivate the temporary support (30) and make the first bag fall towards 
the bottom (22) of the wrapper (20), so that said bag (25) and the 
wrapping (20) go down at the same time; and at the same time the sleeve 
with discontiued seams (24') is closed; being said seams produced in the 
longitudinal direction of one of the sides; 
feeding the temporary support (30) with the next bags (25a) (25b), one at a 
time, so that the pile goes down until pile (p) has a set number of bags 
(23'), bags (25a), (25b) (25n) wrapped by the sleeve (20); 
welding in a cross-sectional fashion (23') the head sheet wall (23) of 
wrapping (20), as well as the bottom (22) of the next wrapping (20), and 
cutting the resulting package (p) by means of a cut (14) in the clear band 
occuring between both weldings (23') and (22'). 
DESCRIPTION 
In general terms, the method in question, for the joint wrapping of bags 
(25) and the contents thereof (25') is that in which bags (25), filled 
with a product (25'), either granule or powder product, form a pile inside 
a sheet, elongated wrapping (20), made of thermo-bonding plastic, whose 
longitudinal edges (24) define a sleeve, and which comprises a closed 
bottom (22) and a closed sheet head wall (23), by means of welded seams 
(22') and (23'). The method in question is characterized in that it 
comprises the following steps: 
1. advancing the bags (25) lying on the transporter (a) in such a way that 
they are pressed evenly without exceeding the maximum volume of the 
contents thereof (25'); 
2. before entering the piling track, and as each bag advances, each of them 
undergoes an even pressing without exceeding the maximum contents thereof 
(25'). This so-called "pressing" is simply performed by pressing over and 
under each bag, in order to produce an even "re-arrangement" of the 
particles of the product in question, so that the bags have a more or less 
standard shape and volume compatible with the shape and capacity of the 
piling track (g) fed by transporter (a) (FIGS. 1 through 6); 
3. place a first bag (25)--identified as (25a)--over a temporary support 
(30) thereof (FIGS. 3 through 5); such that while bag (25a) is on said 
support (30), it is temporarily over bottom (22) of wrapper (20), so that 
welding means (H.sub.w) close said bottom (22) by means of a 
cross-sectional welding seam (22') (FIG. 9-A). 
4. partially defining the continuous sleeve-like sheet wrapping (20) around 
and under the bag (25a) with a welded bottom (22) (22'); 
5. deactivate the temporary support (30) (FIG. 5) and make the first bag 
25a go down towards the bottom (22) of the wrapper (20), so that the bag 
(25) and the wrapping (20) go down at the same time; and at the same time 
the sleeve 20 with discontinued seams (24') is closed ; being said seams 
produced in the longitudinal direction of one of the sides; discontinued 
seams (24') can be oblique in relation to the the longitudinal edges (24) 
of sheet (20), to facilitate the operation as the set falls through 
gravity, as it can be seen in FIGS. 9 and 10. 
6. feeding the temporary support (30) with the next bags (25a) (25b), so 
that the whole pile goes down together with the set (FIGS. 9-B and 9-C) 
until package (p) has a set number of bags (25.sub.a) (25.sub.b) 
(25.sub.n) wrapped by the sleeve (20); 
7. stopping the joint fall of the set, and closing by means of a 
cross-sectional seam (23') the head sheet wall (23) of full sleeve (20) 
(FIG. 9-A) as well as the bottom (22) of the next wrapping (20), and 
cutting the resulting package (p) by means of a cut (14) in the clear band 
occuring between both weldings (23') and (22'). 
In conclusion, there is available an extremely compact package (p), in a 
wrapping fashion around a pile of bags (25) with the loads thereof (25'); 
whose bottom and top portions (22) and (23) are closed and comprising 
cross-sectional seams (22') and (23') all along its length; the sleeve is 
closed by overlapping the longitudinal edges (24) by means of said seams 
(24'), (FIG. 10). 
As for the machine which can be used to carry out said process, it 
comprises a vertical frame (b), which in the top portion has a piling 
track (g), fed by a transporter (a) with bags (25) containing granules, 
powders, etc. (25'), comprising a presser (a') of said bags (25) (FIGS. 1, 
2,3, 4 and 5). In a lower level, and aligned with the reception box 
(29)--a part of said piling track (g)--there are mounted a braking system 
(27), wrapping (22) sleeve-defining head (d), the system of horizontal 
welding means (H.sub.w), the system of vertical welding means (V.sub.w) 
and the spool (c) with all the feeding system of the wrapping plastic 
sheet (22) (FIGS. 1 and 2). 
More particularly, and as it is shown in the figures, frame (b) is a unit 
comprising two large supporting columns (33) on a base or legs (33') 
supporting the whole gear, to which the tracking bars (10) are attached; 
said tracking bars support clamp holding bars (11) (12) and (12') of the 
horizontal welding system (H.sub.w) (FIGS. 1 and 2), as well as the axis 
(20') of spool (c) with plastic sheet (20), the guiding rolls (18), the 
sleeve-defining head (d), and other mechanisms and devices, driven by one 
or more engines 97) through speed reducers, movement transmitters, etc., 
which will not be described in detail as they are not relevant to this 
specification, and can be embodied in many different ways. 
Transporter (a) can be a belt or continuous strap (1), and over it there is 
provided another smaller belt (2), whose wheels rotate in a direction 
contrary to that of transporter (a), which therefore produces an advance 
towards the piling track system (g). 
The distance separating both belts (1) and (2) from transporters (a) and 
(a') is such that bag (25) fits tightly between said belts, and therefore 
it undergoes pressing in order to rearrange the particles of product (25') 
to make it more compact and even. In order to complement this transporter 
(a), at the entrance of the piling track (g), the sides of said 
transporter (a) comprise protruding pressing arms or fins (3), which level 
off the bags (FIGS. 3, 4 and 5). 
It is to be noted that this so-called "pressing" of bags (25) must be 
enough so as to enable the rearrangement of contents (25') in more compact 
and even fashion, without breaking the bag, so that the size and volume of 
each bag (25) are compatible with the capacity and shape of the cavity of 
the reception box (29), where they fit. 
As mentioned above, transporter (a) advances in a uniform lineal fashion 
and reaches box (29) which is a part of piling track (g). 
According to FIGS. 2 and 5, this box comprises a frame with four walls 
built over the containment plane of the top portion of belt (1), defining 
a cavity which is compatible with the shape and size of each bag (25) 
pressed and arranged by superior and lateral pressing means (a) and (a") 
respectively. 
The top portion of said box (29) is open, whereas the bottom portion is 
temporarily closed by a floor (30) comprising two planks which define 
complementary and co-planar semi-floors; by means of a mechanism (34) said 
planks connected to a circuit of pressure fluid (hydraulic, pneumatic, 
etc.) and in answer to a sensor or electric eye command (5), produce the 
alternating displacement of said floor (30), between two positions : one 
of them including facing edges of the semi-floors in contact or as near as 
possible, supporting bag (25.sub.a) temporarily once it has entered (see 
FIGS. 3 and 4), and another which causes the retraction displacement of 
floor (30), which is deactivated in this way (FIG. 5), enabling the 
discharge of said bag through the sleeve defining head (d). 
Likewise, the front wall of the box frame (29), is mobile and defines a 
swinging port (4) with a hinging axis (4'). Every time said port (4), 
which is also commanded synchronously by electric eye (5), opens (FIG. 5, 
and FIG. 4 , dotted line), it allows a bag (25) in the cavity of the 
reception box (29), whereas every time it closes, it prevents any other 
bag from entering the cavity until unloading has occurred (FIG. 4). 
There is a rigid tube (29') under said box (29) and aligned with it, 
surrounded by a sleeve defining head (22), which is a plank folded in a 
hood-like manner (16) as can be seen in FIGS. 1, 2 and 9. 
The polyethylene sheet (22) advances towards said definer (d). Said sheet 
goes from a spool (c) rotating around a lower axis (20') and through 
guiding rolls (17), fits a mobile rotating jaw (18')--assembled on a joint 
arm (19)--and a rotating jaw (18) assembled in the end of a fixed arm 
(19'). 
Between both jaws (18) and (18') there is provided a stopping presser (f) 
of sheet (22), which keeps said sheet tight over hood (16) on which it 
goes up, and finally goes up on the rigid tube (29') (FIGS. 2, 3 and 9). 
Below rigid tube (29') there is provided a system of horizontal welding 
means (H.sub.w) which--as can be seen in FIGS. 1, 2, 6, 7 8 and 
9--comprises welding clamp-holding (12) and (12') bars (11) for welding 
and cutting, said bars are guided in walls (9) and punched to that effect. 
Moreover, said jaw system of H.sub.w is completed by means of two opposite 
blowing nozzles (26) which after going through the sleeve (20) in the area 
next to the backwall welded in (22') form the lateral bellows which form 
in turn a plane base (FIGS. 1, 2 and 6). 
As can be seen in FIGS. 7 and 8, both the clamp (12) and counterclamp (12') 
are U-shaped pieces made of bronze, cooled by air flow and facing each 
other by means of their free arms which end in stretching supports 
(13)--made of synthetic rubber resistant to temperature--and the 
antisliding rigid counter supports (13') (FIG. 7), whose function is to 
keep the polyethlene sheet (22) in place during welding and cutting. 
Inside each "U" of the clamps 12 and 12', there is provided a steel piece 
on which nichrome straps are assembled , which are responsible for the 
lower (22') and superior (23') weldings; in the intermediate central part 
of the system there is provided an especially sharpened cutting blade (14) 
which can be placed in an opposite inlet (14'), and is responsible for 
separating packages (p) and cutting the resulting strip between the 
consecutive weldings (22') and (23') (FIGS. 8 and 9-A). The above 
mentioned straps are fixed at one end on an insulated head, while the 
other end is fixed to a sliding head with springs which keep the strap 
tight and prevents it from becoming loose, and at the same time, the 
dilation thereof is offset when it becomes hot. 
Both straps are covered by a low friction, synthetic resin or Teflon.RTM. 
(available from E. I. Du Pont de Nemours) layer so as to avoid sticking 
with the polyethylene during the sealing process. 
It should be observed that this piece can slide thanks to a cylider whose 
pin (see FIG. 7, left jaw) pushes the blade-holding piece (14) to seal and 
cut the polyethylene. (20). 
Besides, at least one of these jaws (12) can include a regulating screw 
(15) employed to adjust the welding and cutting jaw to secure the perfect 
operation of the sets (H.sub.w), FIGS. 7 and 8. 
This set (H.sub.w) slides not only with horizontal alternating movements of 
the jaws thereof (12) and (12')--for closing or opening, whatever the case 
may be--but also with upward-downward movements according to the the 
vertical geometrical axis of the machine guided in a system column (FIGS. 
1 nd 2); so that the horizontal welding means (H.sub.w)support several 
bags (25.sub.a) (25.sub.b) apart from forming seams (22') and (23'), etc. 
(FIG. 9-B), going down at the same time and gradually as the bag falls, 
until the load is complete 9 FIG. 9-C). During this gradual fall, the 
braking set (e) together with the means (27) (sic) Definer (d) shaped the 
polyethylene sleeve (20) which, on closing laterally makes the areas next 
to the longitudinal edges (24) slide between jaws (31) of a system of 
vertical welding means (V.sub.w) which in turn produce cross-sectional, 
discontinued and oblique seams (24') every time the machine stops, and as 
far as it advances (FIG. 10). 
In the embodiment shown in FIGS. 11 through 15, the machine is structured 
in an analogous way, except for the bags exit (25), which instead of being 
discharged through gravity, is carried out by means of a holding head 
(37). In fact, according to FIG. 14, transporter (a) is in this case, 
roll-driven , and delivers bags (25) in the reception area where the 
piling track (g) is provided, said area is surounded by the gate or 
reception box (29). 
In this embodiment, definers (3) are not necessary as the bag (25) enters 
the box (29) directly, which is wider than the rest of the transporter (a) 
(FIG. 14) and where therefore the cornering elbows (3') are provided. 
Over the piling track (g) there is provided a vertical pin (35) slidingly 
guided between columns (36) of a frame (36') with controlled 
upward-downward movements in relation to the roll floor (1') 
A holding head (37) is fixed to said pin (35)--FIGS. 12 and 13--and in the 
lower part there is assembled a set of curve-like tweezers (38) which form 
a small pressing clamp for the bags (25), in an open position (for 
example, by means of springs which are not shown); but arranged in the 
area near the two pushing members (4")--comprising pneumatic sliders or 
similar--facing one another (FIGS. 11 through 15). Said pushing members 
(4") are horizontally arranged (FIG. 13), and function according to the 
set of rolls (1') aligned in two lines (FIG. 14) thereby forming an open 
floor. 
Below the opening of said floor (1'), there is provided a definer head (d) 
of the sleeve formed by sheet (20); this part is similar to the embodiment 
described in first place. In the lower part of the structure there is 
provided a sensor (5'). 
The system works as follows: 
As transporter (a) advances, bags are forced to pass between the straps 
thereof (1) and (2) and the superior presser (a'), as arms (3) of the 
lateral presser (a') standarize the sides and folds of said bags. 
Before this, the sleeve has closed along the back wall thereof (22), and 
with the welding seam (22') (FIG. 9) and the set (H.sub.w) supports the 
pile of bags to be loaded (at least, half this pile, after which, as this 
pile is held by brake (e) it goes up to support the second half. 
The first bag (25a) pressed in this way, with port (4) open and floor (30) 
closed (FIG. 4), enters the cavity of box (29), and the front edge of the 
bag (according to the direction in which it advances) drives sensor (5) 
which in turn closes the port (FIG. 3), so that the next bag does not get 
stuck. 
Then, said electric eye (5) produces the retraction of back (30) commanded 
by mechanism (34), so that bag (25a) because of its own weight falls 
through a rigid tube (29') until it reaches closed bottom (22) of wrapper 
(20). 
Because of the weight of bag (25a), and as a brake (e) is deactivated by 
the action of a sensor, the bag (25a) and the wrapper (20) fall together; 
then the vertical welding produces the first cross-sectional discontinued 
oblique seams (24") along the overlapping edges (24). The intermediate 
sensor operates through the shadow of the bag: when the bag passes by, the 
brake (e) which holds the set firm is activated; when the bag has passed, 
the brake is released and the whole set can go down. 
Then, port (4) is open again by the action of the sensor, so that the 
second bag (25b), already pressed, enters reception box (29). In this 
case, and the following cases, floor support (30) is not necessary--said 
floor is not activated until package (p) is ready--as the next bags 25b to 
2n fall and are held by bottom (22) and by the clamps of the closed 
horizontal sealing system. 
As each bag (25) enters to complete the pile, the set goes on descending 
proportionally so that the vertical welding and the seams mentioned above 
produce the longitudinal edge of wrapper (20). 
The process is repeated until package (p) is complete, and a final portion 
of the wrapper is left with a neck of a certain length; then the double 
seam is produced: one reference (23') in the laminar head walls (23) is 
used to close the resulting package(p); and the other, reference (22') is 
used to to close the back walls (22) (FIGS. 9A, 9-B and 9-C); while at the 
same time, the cutting blade (14) on closing against (14') in the 
intermediate area between said seams (22') and (23') produces the cut 
separating package (p), FIG. 9-A, and package (p) is left as shown in FIG. 
10 of the drawings illustrating the invention. 
In the embodiment of FIGS. 11 through 15, the machine is equal to the first 
embodiment except for the transfer area of bag (25)--which is the one 
shown in said figures--between transporter (a)--as from piling track 
(g)--and the inside of laminar sleeve (20). 
When bag (25)--which is expanded with its corners retracted in (a)--reaches 
reception area in (g), as it is wider the corners expand; so that bag (25) 
advances until it reaches the front wall of (g), and then expands as a 
stop, against corners (3'); so that each bag is self held inside the frame 
of (g). 
Under these circumstances controlled by electric eye (5), bag (25) is taken 
by tweezers (38) which close (FIGS. 1 through 13 and in particular, FIG. 
15) and deforms, as the liquid or particle contents thereof rearrange. 
To produce this closing, pushing means (4") act (FIGS. 11, 12 and 15), 
until the size of bag (25) is compatible with the cavity of the sleeve 
(20). 
Then, the floor of rolls (1') is open, and head (37) of tweezers (38) goes 
down through opening (20) until the bag is left on the bottom thereof; and 
then one bag on top of the other until a complete pile is formed. 
During this process, the whole set goes down as described above and as it 
is shown in the sequence of FIG. 9; once the pre-set number of bags is 
reached, lower sensor (5') enables the closing and cut explained above, 
shown in FIG. 9A. 
Though the invention has been described with respect to certain embodiments 
thereof, it is obvious that equivalent alterations and modifications will 
occur to those skilled in the art upon reading and understanding the 
specification. The present invention is limited only by the scope of the 
claims without departing from such principles.