Process for the continuous molding packaging of a product in paste semiliquid or liquid form

For molding and packaging a product having paste, semiliquid or liquid form, e.g., frankfurter-type sausage paste, two films such as thermoplastic films are fed longitudinally, respectively above and below tubes feeding the product. For each of the feeding tubes, a longitudinal tubular cavity is formed between the films, e.g., by localized longitudinal welding, and the tubular cavities are filled with the product being fed. In feeding the films and the product, transverse seals are formed at intervals to terminate the filled cavities, e.g., by localized transverse welding of the films.

I. BACKGROUND OF THE INVENTION 
This invention refers to a process for packaging a product in paste or 
semiliquid form and the machine for carrying out said process and the 
product thus obtained. 
In a preferred form of embodiment the process and the machine of this 
invention are used for packaging sausage, commonly known as the 
frankfurter type sausage. 
It is presently widely known that sausages, particularly the frankfurter 
type sausage, are stuffed in a tripe or tube of synthetic material 
(plastic) , and which must be then peeled off at the time the sausage is 
to be prepared for ingestion. 
Known processes in use are comparatively expensive and slow, as they 
require steps which could be set aside and which, in turn, require the use 
of expensive machinery. 
In fact, and so as to summarize the present operative procedure, the food 
stuffed in synthetic tripe of great length which, is in turn twisted at 
pre-determined sites so as to form a row of independent sausage, of a 
particular length, which hang in carriers for cooking. After this latter 
operation, the sausage must be cooled so as to submit it to the peeling 
action of the peeling machines. That means that the plastic lining or 
sleeve (tripe is removed so as to have sais sausage packaged in vacuum). 
Known processes for the elaboration of skinless sausage require the use of 
four machines, namely: (a) the stuffing machine, (b) the cooling and 
twisting machine, (c) the peeling off machine, and (d) the packaging 
machine. Between the twisting and peeling stages, the sausage is cooked, 
such as the frankfurter type sausage, salami, etc. Once cooked the product 
is passed through the cooling and peeling machines, and then carried to 
the packing machine so that, once this stage is completed, sausage can 
then be delivered. On account of the characteristics of the known process 
of elaboration, there occurs an approximately 8% reduction in raw 
material. 
The above-described conventional line of elaboration requires a minimum 
place of 12 meters long for the five mentioned processes. 
As it is not possible to achieve an absolute vacuum, in the conventional 
package there appears a small amount of air in contact with the product, 
which makes the product perishable in a more or less short time on account 
of contamination. 
Technology further developed new packaging processes but the same were 
created for the packaging of products in granule, powder or liquid form, 
in which the amount of product to be packaged is regulated by a delivering 
device and no pressure is required on the product in order to shape the 
package. 
On the other hand, said processes lack a continous sequence, but are of an 
intermitent sequence, whereby their yielding is seriously limited as 
compared with a process of continuous sequence. 
In the particular case of the packaging of frankfurter type sausage, the 
problem arising from the attempt to obtain a continuous method is worsened 
by the cooking process, as well as by the fact that the sausage paste 
adopts the shape of the package, which requires certain pressure at the 
packaging stage. Said pressure causes the transversal section of the 
package to be constant and the product weight is thereby also constant and 
is directly proportional to the length of the package. 
Also related to the continuous process is the need for the package shaping 
the sausage to be the final package to be delivered to consumers, so as to 
avoid contamination produced when the product must be enclosed within the 
final packaged once shaped and cooked. 
U.S. Pat. No. 5,053,239 refers to a process and apparatus for producing 
frankfurter type sausage and claims that the sssausage is produced 
directly within the final package, which then allows the cooking of the 
sausage paste thus packaged. 
However, though said process seems to achieve a certain improvement over 
the already known processes, it is of intermitent sequence and requires a 
synchronism between feeding of the portions forming the sausage and the 
means for transversally closing the package. As said patent contains no 
illustration of the particular machine for producing the pieces of sausage 
paste of a pre-determined size, nor does it show the manner in which said 
operation is controlled in order to attain a synchronism of the means for 
transversally closing the package, it can be considered that said process 
is not likely to be carried out in practice. 
In fact, it is to be noted that feeding tubes 1 extend between peripheral 
grooves of cylinders 14 and 15 until reaching the discharge outlet near 
the shaping means formed by rods 4 and 5, which further contain elements 
transversally pressing the portions of the tubular package containing no 
sausage paste. The specification of said U.S. Pat. No. 5,053,239 also 
fails to explain the advance movement through the feeding tube of small 
portions of sausage paste and the kind of means used for making each 
sausage portion maintain a constant space regarding the subsequent 
portion. Furtermore, for the transversal sealing of the film, the process 
requires that said area be free from sausage paste, which makes it 
noticeably different from the method of this invention. 
The system provided in Argentine Patent 228,903 is already known, said 
patent case referring to a discontinuous feeding system. 
Such system operation consists in feeding molding cavities between 
longitudinal pre-welded films, but said cavities are interconnected by 
minor channels, thus producing a zig-zag path between films, and the zones 
where said channels are arranged are then sealed up. 
In fact, it is hard to believe that this process actually works, as the 
paste pressures and the section differences in path and in the zig-zag 
arrangement produces at least a stopping effect on the sliding movement, 
which at least reduces yielding to non-economical limits. 
The process and machines of this invention allow the continous production 
of products in paste or semiliquid form, by using a single package shaped 
by pressure exerted by the product and wherein the stuffed packaged 
comprises a transversal section and a length measure of the package. 
In the particular case of the packaging of frankfurter type sausage, sais 
sausage is packaged without need of a synthetic tripe forming the sausage. 
The sausage is then packaged within the final package to be delivered to 
consumers and is then cooked, which secures the non-contamination of the 
product during the production process. The pressure whereby the sausage 
paste is packaged removes all possibilities of having any air remainder 
within the package which could then affect the product. 
In addition, the process and machine of this invention brings about 
important economic advantages, such as: an important cost reduction over 
the raw material required for the sausage elaboration on account of the 
elimination of the synthetic tripe, which cannot be substituted in the 
conventional process; a significant reduction of processes and steps, 
since the sausage produced with this machine, such as hereinafter 
explained, is cooked and then directly delivered; less 8% reductions 
produced in the conventional process, which are practically eliminated; an 
important increase in production yielding, as the machine of this 
invention, when operating at its maximum speed, exceeds four times the 
production capacity of the conventional machinery, and it can increase its 
yielding up to eight times more when operating at higher speed, without 
any difficulty. In addition there is a significant reduction of the 
surface required for production premises, since it is one single machine, 
it is of reduced sizes, namely, 2 meters, as compared with the known ones 
which presently require 12 meters, and since it has a production rate very 
much higher than those presently known in the art. 
II. MAIN OBJECT 
The process of this invention essentially consists in a continuous process 
for packaging a product in paste or liquid form, which comprises the 
following steps: 
continuously feeding a pair of films, one above and the other below the 
feeding tubes of the product to be packaged; 
continuously shaping in said films tubular longitudinal cavities around 
each of said feeding tubes; 
wholly filling, with the necessary pressure and in continuous form, said 
tubular cavities with the product to be packaged; 
without interrupting the advance movement of the tubular cavities filled 
with the product, pressing on transversal stripes over said cavities until 
said films come into contact, and 
welding said films one to the other, thus forming the vacuum tight package 
of the packaged product. 
Likewise, the machine required for carrying out the process of this 
invention constitutes a further inventive object, which consists in a 
machine which comprises a continuous advance feeder of two thermoplastic 
film set having guides leading to a zone where both overlapping films 
concur and a transversal folding means for one of said films, thus 
defining continuous longitudinal cavities alternated by longitudinal 
stripes overlapping the other film; a longitudinal unit for welding the 
overlapping longitudinal stripes, at the end of which outlets of a package 
product feeder are arranged, which loads said product throughout the 
length of the cavities formed by the folding means; and a unit for welding 
the transversally overlapping stripes which, with pressing means, works at 
predetermined distances up to the contact limit of both films in said 
stripes of the set of films; wherein each welding unit comprises heating 
means followed by cooling means correlatively arranged in said order 
according to the advance direction of the set of films. 
A further object of this invention is a molding package containing the load 
resulting from the process and formed by the machine as above described, 
which comprises two plastic films, which form casings which receive the 
product molded "in situ"; said casings, which are formed by cavities 
resulting from only one of said films and which are closed by the other 
film like a fixed tap, constitute fixed compartments defined by the seams 
of continuous welding, which cover stripes of longitudinal joint, which 
cross stripes of transversal joint around said casings. 
The object of this invention consists in a series of characteristics which, 
once combined, allow to obtain a high scale production of frankfurter type 
sausage or other products, which are molded "in situ" in their own package 
which is formed during the same process. 
Said process is, on the one hand, continuous as it permanently feeds at a 
constant speed both the package forming film and the paste intended for 
producing the product to be packaged. 
Said process is also continuous since, during said advancing movement, a 
longitudinal sealing occurs among the continuous product compartments, as 
well as the subsequent transversal section sealing, which also occurs with 
the sliding movement of the product in said area, without interrupting 
said advancing movement. 
Said transversal seal allows the necessary pressure on the said paste used 
in the production of a package with a predetermined shape. 
This process is further safe as to the sealing pattern, and since it is 
produced by sets of heating means (which soften the molecules of the 
material by fixing films one to the other), correlatively followed by sets 
of cooling means which fix the welding seams, thus avoiding a taking off 
procedure as a result of the inner pressure. 
According to this invention, the past feeding tubes, together with a set of 
rods, produce the necessary film folding for defining the cells receiving 
said product. 
A further object of this invention is that of including means for 
controlling the aligned feeding of films intended to form the package, 
including means for correcting and balancing any deviation of said films 
so as to secure an exact overlapping. 
In the light of the above, one can now imagine that said system will be 
widely accepted once put into practice, regardless of the category or use 
assigned thereto, since on account of the characteristics that define the 
same, it can be equally used for the packaging and molding "in situ" of 
all kind of foodstuff products, sweets, medicinal products, chemical 
products and the like, either in the form of a paste, gelatin, emulsion, 
and liquid, etc. 
II. MAIN OBJECT 
For the above specified purposes and such as it is claimed, the said 
process for the molding packaging of foodstuff substances and other 
applications, which could be intended for the packaging of products such 
as frankfurter type sausage paste (30), either skinless or others, said 
process further comprising two overlapping thermoplastic films (1) and 
(2), for shaping fixed casings for packaging and molding the product (30), 
said process being characterized in that it produces the feeding of films 
(1-2) and the product (30) to be packaged therebetween by the joint 
sliding (1-2-30) and advance movement; longitudinally folds (1') one of 
the films (1), thus forming in each folding longitudinal continous 
cavities (3) defined by longitudinal stripes (1"); join by continuous 
welding (31) said longitudinal stripes (1") of the first film (1) with 
zones overlapping the second film (2), by two correlative heating (e) and 
cooling (f) stages, respectively, while the continuous advance movement of 
the arrangement (h) remains, so as to form tubular cavities; 
simultaneously introduce throughout the resulting tubular cavities (3), 
the product (30) to be packaged; divide the set of films (h) and the 
product (30) by jointly pressing on the virtual transversal stripes which, 
at predetermined distances, cross said tubular cavities (3) with product 
(30), thus forcing product (30) to move and causing the pressure resulting 
from contents of said zone; and, once films come into contact in each 
transversal stripe (32), said films are welded the same as for the film 
union (1-2) in longitudinal stripes (31). 
In addition, as a result of the pressure produced in the transversal 
stripes and the subsequent welding operation, the desired shaping is 
obtained at the ends of the fixed casing.

IV--DESCRIPTION 
In general terms, the process for packaging products such as sausage paste 
(3), either skinless or other, using two overlapping thermoplastic films 
(1) and (2), so as to form fixed casings for the packaging and molding of 
the said product (30), is characterized by comprising the following 
stages: 
1) Feeding the thermoplastic films (1) and (2) as well as product (30) to 
be packaged therebetween, by a jointly sliding and continuous advancing 
movement (1-2-30). 
2) Longitudinally and uniformly folding upper film (1)--while the other 
film (2) remains unfolded--, thus forming in each fold longitudinal 
continuous tubular casings (3) defined by longitudinal stripes (1"), 
wherein rigid pipes (18) channeling the package product (30) are used as 
part of the longitudinal folding pre-shaping means (d). 
3) Joining by continuous welding of joint (31) said longitudinal stripes 
(1") of the first film (1) with overlapping zones relative to the second 
film (2), by means of two correlative heating (e) and cooling (f) stages, 
respectively, while the continuous advance movement of (h) is maintained 
to form tubular casings with films (1) and (2), simultaneously introducing 
the package product (30), such as frankfurter type sausage paste, along 
the resulting tubular casings. This union of film overlapping stripes is 
made by joint welding, by means of heating means (e) and cooling means 
(f)--e.g. rotating ones--, which are correlatively arranged in said order 
and which determine the same advance speed for both films. 
4) Dividing the set of films (h) with the load of product (30), by jointly 
pressing on both virtual transversal stripes which, at predetermined 
distances, cross said tubular cavities (3) with their load (30), thus 
forcing the said load (30) contained in said zones to move, with the 
resulting pressure for shaping the tubular cavity in the predetermined 
manner. 
(5) Welding said films in the same manner as for the film joint (1) and (2) 
of longitudinal stripes (13), once said films have come into contact in 
each transversal stripe (22), This film welding of stripes (32) is made by 
joint welding, using a transversal welding unit (D) and eventually a 
cooling means (g), which work in continuous advancing movement as 
correlatively arranged in said order. 
The means pressing upon said transversal stripes and producing the 
subsequent welding, also produce the desired shaping at the ends of the 
fixed casing. 
The means carrying the heating clamps supply the set of films (h) with a 
speed slightly higher than that defined by rolls of the longitudinal 
welding unit (B), so as to attain the suitable tension in said film set 
(h). 
The machine for shaping packages and for packaging the product at stake 
(FIGS. 1 to 8), substantially comprises a frame (a), a continuously 
advancing feeder (A) of film material comprising a pair of thermoplstic 
films (1) and (2), and a continously advancing feeder (c) of product (30) 
to be packaged, which is channeled between said films (1) and (2). 
At the inlet of the machine, there is a longitudinal folding pre-shaping 
means(d)(1') in one of said films, preferably the upper film, this being 
the first film (1). 
Subsequent to said folding pre-shaping means (d) and according to the 
advancing direction of the film set (h)--formed by films (1) and (2)--the 
following elements are arranged: a transversal welding unit (D) of the 
already shaped films in packages containing product (30) (FIGS. 1 and 2). 
More particularly, and as shown in the attached figures, the continuously 
advancing film feeder (A) comprises a coil (4) which, through a 
guide-tensor roll (5), feeds with the first thermoplastic film (1), which 
is directed to the inlet of the machine on a support plane guide (35) so 
as to overlap a second film (2) arranged in an lower position and fed by a 
lower coil (6) with the corresponding guiding and tensor rolls (5') (FIGS. 
1 and 3). 
By means of a force pump, an endless worm and other conventional mechanisms 
(not shown), the package product (30) reaches distributing case (17) 
through feeder (c), from which distributing case said product is channeled 
by a plurality of rigid pipes (18) (which number corresponds to the 
predetermined number of packaging lines), which extend at the inlet of the 
machine, passing through the folding pre-shaping means(d) of which they 
are component parts, and end in outlets (18'), which are arranged beyond 
the zone where cooling rolls (f) of welding unit (B) are present (FIGS. 1 
and 3). 
An automatic balancing device for the alignment of films (1) and (2) 
secures the exact overlapping of said films when concurring at the 
entrance of the machine, so as to avoid an angular transversal movement 
between said films (1) and (2), which would prevent the formation of the 
packaging casings. 
To that effect, and as clearly shown in FIGS. 1 and 3, coil (4) of first 
film (1) is mounted on an arm (36) fixed to a transversal balancing 
carriage (26) which, by wheels (27), moves along a rail pattern in a 
direction transversal to the machine on guide (25), which is fixed to 
frame (a) of the machine. This carriage is electrically driven by a 
circuit controlled by photoelectrical sensors (29) and alignment guides 
formed by rolls (28) laterally arranged with respect to said rigid pipes 
(18). 
The pre-shaping device (d)--FIG. 4--consists in a support (21) having 
mounted thereon a plurality of means for the attachment and lengthening 
(20) of rods (19) which, being threaded, are at their lower portion 
T-joined to longitudinal folding members (19'), which are rods at an 
equidistant direction with respect to the longitudinal direction of the 
machine and which, as shown in FIG. 1, comprise an initial bending zone in 
the form of suggested engagement, and which are arranged as partially 
inserted with respect to the rigid pipes (18)--FIG. 4--, so that the 
longitudinal folding (1') is produced on the first film (1) guided between 
members (19') and the said rigid pipes feeding (18), said longitudinal 
folding being completed when film set (h) reaches the zone where welding 
unit (B) is disposed. This folding pre-shaping means (d) is completed by 
regulating means (23) which allow to modify the folding size when 
modifying the height of support (21) and thereby also modifying the 
distance between members (19) with respect to rigid pipes (18) and also 
the transversal section of tubular casing (3). 
On the other hand, welding unit (B) consists in a first set of welding 
rolls (f), correlatively followed by a second set of cooling rolls (f). 
Welding rolls (e) comprise a pair of upper rolls (7) in parallel 
arrangement with respect to each other and having peripheral grooves (7') 
defining plane welding edges (37), and a lower roll (8) having heating 
means such as electro-resistors or the like and which periphery comprises 
welding edges (38) separated by peripheral grooves (8') (FIGS. 1, 2, 3 and 
5). 
Rolls (7) are in parallel arrangement to each other in a same plane beyond 
the path of film (1) and on both sides of the vertical plane passing 
through the axis of lower roll (8), said rolls (7) being arranged below 
film (2). 
The arrangement of welding edges (38) in peripheral grooves (8') allows the 
heating thereof only for welding stripe (2') for longitudinal overlapping 
of film 2. 
In turn, and subsequent to heating rolls (e), cooling rolls (f) comprise 
upper and lower grooved rolls (10), the latter ones being refrigerated 
through a conduit (12") by a refrigerating fluid coming from refrigerating 
means (39). 
Grooves (7') of rolls (7) are of the same size as grooves provided in the 
upper roll (10) and are arranged in alignment with each other. Likewise, 
grooves (8') of lower roll (8) have the same size as grooves provided in 
lower roll (10) and are also arranged in alignment with respect to each 
other. 
Thus, grooves (7') and (8') and those provided in rolls (10) form a path 
through which feeding rigid pipes (18) extend from distributor (17) until 
exceeding at a predetermined distance the said set of rolls (10). 
On the same plane as guide (35), a support table (24) is provided for the 
movement of the film set (4) between the set of rolls (10) and the 
transversal welding unit (D). 
At the end of said support table (24) facing the transversal welding unit 
(D), a leading element (40) is disposed, which comprises a plurality of 
partitions (41) in parallel arrangement with respect to each other and 
being perpendicular to said support table (24). Each partition is in 
alignment with welding edges (37) and (38) of rolls (7) and (8) and, 
therefore, with its longitudinal welding stripe (32) of film set (h). 
The transversal welding unit (10) disposed following the free end of the 
support table (24) comprises a roll (42) in tangent arrangement above said 
support table (24) and comprises on its surface a plurality of fixed jaws 
(13) which are projected beyond said surface and are arranged in 
equidistant generatrixes with respect to each other, which separation is 
defined by the length of the individual package to be formed. 
At the same time, a plurality of separators (43) extends between each pair 
of jaws (13), the distance between said separators corresponding to the 
distance between partitions (41) of the leading element (40). 
Jaws (13) comprise conventional heating wheels (not shown) such as 
electro-resistors. 
Jaws (13) have a plane welding surface (54) which is parallel to the 
generatrix of roll (42) and each of said side surfaces (55) extending from 
the plane welding surface (54) up to the roll surface (42) has a 
configuration defined by the shape to be given to the ends of each 
individual package of the product (30). Similarly, said configuration of 
side surfaces (55), when reducing the transversal section of the tubular 
casing (3), produces the necessary pressure from product (30) in its final 
individual package. 
The respective annular supports (44) are arranged at the ends of roll (42), 
said annular supports comprising radial projections (45) on which the 
respective pinions (45) are rotatively mounted, said pinions carrying the 
respective endless driving chains, of which only their path has been 
illustrated in FIG. 1 for the better comprehension of the transversal 
welding unit (D). 
Moving jaws (47) are mounted on both chains, the distance between said 
moving jaws (47) being the same as that separating fixed jaws (13) of roll 
(42), and said moving jaws being synchronized so that, when driving chains 
of moving jaws (47) rotate, they overlap fixed jaws (13) and push film set 
(h) through said fixed jaws (13) and moving jaws (47). 
Following the end of the path of moving laws (47) pressing fixed jaws (13), 
there is a cleaning unit (50), which coincides with and extends along the 
generatrix of roll (42), which comes into contact with film set (h) being 
released from the pressure exerted by fixed jaws (13) and moving jaws 
(47). 
In another form of embodiment of this invention shown in FIG. 8, the 
pressure of film set (4) on fixed jaws (13) is produced by means of an 
endless belt (34) mounted on rolls (52) rotatively mounted on radial 
projections (45) of annular supports (44), the movement and tension of 
said endless belt (34) being controlled by a motor roll (53) mounted near 
roll (42) in a regulated manner. 
The process of this invention is carried out by the above described machine 
as follows: 
Film (2) is fed from lower coil (6) around tensor guide roll (5') up to 
guide (35), passing thereabove, until reaching upper grooved rolls (7) and 
heating roll (8). 
Film (1) of coil (4) is fed passing over tensor guide roll (5), above rigid 
pipes (18) and under folding pre-shaping means (19'), among feeding guides 
(28), above guide (35), until reaching upper grooved rolls (7) and heating 
roll (8), said film 1 being thus correctly overlaping film (2). 
As the path of film (1) occurs through longitudinal folding pre-shaping 
means (d), said film (1) is subject to a different traction system with 
respect to film (2), for which reason, the former can have deviations 
along the overlapping path relative to said film (2) and cause 
inconveniences with the formation of tubular casings on each rigid pipe 
(18). For that reason, before entering said folding pre-shaping means (d), 
a photoelectric sensor is disposed, which controls the edge of film (1) 
and, when the predetermined path is moved, said photoelectric sensor 
activates a motor (not shown) which moves the balancing carriage (26) 
conveying coil (4) on its arm (36), on guide (25) fixed to the machine 
frame by wheels (27), until the detected deviation is corrected. 
Feeding guides (28) laterally arranged with respect to said rigid pipes 
(18) cooperate with the said suitable overlapping between film (1) and 
film (2). 
When films (1) and (2) reach upper grooved rolls (7) and lower heating roll 
(8), as shown in FIG. 5, film (2) is arranged in a substantially plane 
manner on the plane welding edges (37) of said heating roll (8), thus 
producing the heating of longitudinally overlapping stripes (2"), while 
film (1) forms longitudinal tubular casings (3) on and partially around 
rigid pipes (18), which defines longitudinally overlapping stripes (1"), 
with said overlapping stripes (2"), which are pressed one to the other by 
plane edges (37) of upper grooved rolls (7) and plane edges (38) of 
heating roll (8), thereby producing the heating of also longitudinally 
overlapping stripes (1") and the subsequent thermo-sealing thereof as a 
result of the pressure and heat thus applied, longitudinal welding stripes 
(31) being thus defined. 
Following the advancing movement of the film set (h) formed by films (1), 
which forms tubular casings (3) and plane film (2), said film set (h) then 
passes through upper and lower grooved rolls (10) of the cooling system 
(f), which, upon pressing longitudinal welding stripes (31), cool them, 
thus quickly completing the fixing of thermoplastic welding to said 
longitudinal stripes (31). 
The respective tubular casing (3) being thus formed around each rigid pipe 
(18), the respecting casings for housing the product (30) to be packaged 
are thus defined, said product being supplied to said respective tubular 
casings (3) through outlets (18') of rigid pipes (18) for feeding the 
product (30) as the said film set (h) advances. Said outlets (18') are of 
course arranged within tubular casings (3) beyond rolls (10) of cooling 
means (f), and above the support table (24) for supporting film set (h), 
the load of product (30) being within tubular casings (3). 
For a suitable guiding operation and so as to allow the transversal sealing 
of tubular casings (3), film set (h) passes through leading element (40) 
so that tubular casings (3) pass between partitions (41), which keep the 
lateral pressure of said tubular casings of product (30), while 
longitudinal welding stripes (31) pass below partitions (41). 
At the outlet of partitions (41), film set (h) is taken by jaw (13) of the 
corresponding roll (42) and moving jaw (47) of transversal welding unit 
(D), which makes tubular casings (3) to become flattened in said zone and 
attains the total movement of product (30) until films (1) and (2) come 
into contact one with the other, circumstance which, on account of the 
heating effect of fixed jaws (13) and the pressure exerted by moving jaws 
(47), thus produces transversal welding stripes (32). 
As a result of the advancing movement of film set (h) on transversal 
welding unit (D), and the sealing of the first transversal stripe (32) 
being thus produced, tubular casing (3) and the product therein contained 
are housed between separators (43) provided in roll (42) between each pair 
of fixed jaws (13), until fixed jaw (13) and moving jaw (47) produce 
pressure and the subsequent flattening of the respective zone of the 
tubular casing (3) and the product therein contained, until films (1) and 
(2) come into contact one with the other, which, on account of the heating 
effect of fixed jaw (13) and the pressure exerted by moving jaw (47), 
produces the thermo-sealing of said second zone of contact between films, 
thus forming the second transversal welding stripe (32), which closes the 
open end of tubular casing (3) and forms the individual package of product 
(30) in the manner shown in FIG. 9. 
The ends of each package of product (30) adopt the shape defined by side 
surfaces (55) of fixed jaws (13). 
Film set (h) at the outlet of the last moving jaw (47) passes through the 
bent surface (51) of the cooling unit (50) so that plane film (2) is the 
one which comes into contact with the same bent surface (51), whereby 
transversal welding stripes (32) are promptly cooled. 
Once the individual packages of product (30) are obtained, as shown in FIG. 
9, said packages then undergo normal cooking and refrigerating processes, 
as well as partial cuttings on/or weakening zones on longitudinal welding 
stripes (31), as well as on transversal welding stripes (32). 
Movements made by rolls of the longitudinal welding unit (B) as well as 
those made by transversal welding unit (D), and the advance movement made 
by the balancing carriage (26), have not been illustrated for being 
obvious to an expert in the art and so as to better show the inventive 
concept of the machine carrying out the process of this invention. 
There is no doubt that once this invention is put into practice, the same 
could be modified as to certain details of construction and shape thereof, 
which will not imply a deviation from the main principles clearly 
supported by the hereto attached claims.