FR2512328A1 - PROCESS AND DEVICE FOR THE PRODUCTION OF HOLLOW BAKERY, FILLED AT LEAST PARTIALLY ON ITS INTERNAL SIDE - Google Patents

Abstract

A BAND OF WAFFLE 1 STILL SOFT COMING OUT OF THE OVEN IS HELICOIDALLY WOUND ON A CHUCK 2 IN ORDER TO CONSTITUTE A BODY 39 SHAPED SHAFT. THIS BODY IS COATED ON ITS INTERNAL FACE WITH A MASS APPROPRIATE FOR CONSUMPTION, AND CUT IN PIECES OF DETERMINED LENGTH, THE COATING MASS BEING BROUGHT THROUGH THE CHUCK IN DIRECTION OF ITS FREE END AND APPLIED ON THE INTERNAL SIDE OF THE BODY . ONE OR MORE MASSES ARE DEPOSITED ON THE INTERNAL FACE OF BODY 39 BY MEANS OF CHUCK 2. POSSIBLY WHERE THE MASSES ARE DISTRIBUTED, AFTER ENCOUNTERING THE INTERNAL FACE, ON AT LEAST PART OF IT, AND POSSIBLY A RUNOFFING PRODUCT WHICH SHOULD BE APPLIED OVER THESE, AND OR A FILLER WHICH IS TO BE INTRODUCED INTO THE BODY 39 IS BROUGHT THROUGH CHUCK 2. USE TO MAKE WAFFLE PRODUCTS.

Description

The invention relates to the manufacture of a hollow pastry filled with

  less partially on its inner side and possibly at least partially filled, with a

  body consisting of a rolled-up pastry ribbon, in par-

especially a waffle band.

  It is known in the food and

  consumer products, among others, several embossed products made by machines which, filled or not filled, are put on the market and are generally known as consumer products. These products of the waffle industry are for example bags made of waffles, waffle cups, waffle plates, waffle flat plates, low-height hollow wafers, roll wafers, (cigars), small waffle rolls, ice cream cones, filled wafers, wafers frozen, small bars of filled wafers, slices of waffles and the like For these embossed products are therefore cooking products prepared from waffle dough, of crisp consistency, fragile, which break easily; they must come out of the cooking as dry as possible and present a

very low moisture content.

  -The various embossed products can be made of

  different ways and manners So some of the

  wafers are already cooked in their final form, this

  This is the case, for example, for waffle bags, gobballs

  waffle discs, wafer discs, hollow wafers of low height, etc. When making other embossed products, a waffle sheet or an endless band is first baked.

  waffle and give it its definitive shape in the elastic state

  of the oven outlet, the form in which the product

  embossed cools and takes on its crisp and crisp

  Examples include sugar ice cream cones, hollow rolled wafers, waffle rolls with

sugar and the like.

  For the manufacture of other types of embossed products, several sheets of waffles are baked, cooled, filled with cream and stacked in a block of waffle. This waffle block filled with cream is then cut into small pieces. manageable of the same size that is then packaged in units composed of one or more pieces,

  possibly airtight, which are commercially available

  lisées. Depending on the product, the different embossed products may be covered with a sugar or chocolate covering or may be stuffed in different ways, for example with consumer ice cream, various creams, chocolate or the like. Waffle products described above should be distinguished from waffles prepared by the housewife in waffle irons, which represent a soft cooking product, resembling buns or pancakes. These waffles prepared by the housewife have no resemblance to

  their consistency with the embossed products of

  waffle industry described above.

  It is known to the AT-PS 262 187 to manufacture a barrel-shaped waffle body by winding a waffle ribbon which is still in a hot and plastic state, the waffle band being fed by a cooking machine. waffles that

  operates continuously being wound on a winding mandrel

  continuously, and with a helix with overlap, to

  The rotating mandrel which is fixed or rotatably mounted and which is rotated is equipped with a longitudinal bore which tapers at the free end of the housing.

  winding mandrel, at its outlet, as a spray nozzle

  Through this a fat or chocolate is sprayed on the inner side of the barrel-shaped body. After hardening of the barrel-shaped body and the substance deposited on it by spraying, it is cut by means of a sponge. This known method only allows the use of substances that can be sprayed or rendered sprayable by heating.

  a carrier medium, for example air, is born.

  necessary to achieve a fine distribution of the substance applied by spraying If the fat or the chocolate to be applied is liquefied by heating, because of the danger of overheating their liquefaction by heating is limited, so that in this case also the The air has to be mixed as a carrier for the substance to be sprayable. It has been found that this process has the disadvantage that the sprayable amount is limited by the air used as a carrier medium, and that can not be removed. not escape-waffle body wrapped during cutting without destroying the waffle body itself A liquefaction of substances

  dissolved in a solvent or by mixing with other

  which is already impossible because the substance in ques-

  It remains adherent on the inner side of the barrel-shaped body only when the solvent, or the liquid carrier of the substance, evaporates or is absorbed by the body itself of the waffle For the evaporation of the solvent, or

  much of the liquid vector, the hollow space which is at the in-

  The interior of the wafer body is much too small, or the time available until the cutting of the barrel-shaped body is not sufficient. Absorption of the solvent or

  of the liquid vector by the waffle body itself is entirely

  This should be excluded because this would destroy the waffle body. Another disadvantage that occurs when a fat or chocolate is

  inner face of the waffle body is that the spray

  The formation of a fog that fills the entire hollow space of the endless waffle body in the form of a sheath, this fog fouling the circular saw used for cutting the body so that with time it

  becomes unusable and must be cleaned

  what brings an interruption in the process of making the waffle body In addition to the fog that

  was formed fate between cutting operations in the middle

  This is also a disadvantage of the ambient environment and the clogging of the entire coating.

  only a single coating material can be applied.

  If the sleeve-shaped waffle bodies made by this known method are to be filled, this is only possible after sawing into pieces since it is only then that the introduction of the filling mass into the -buffer sleeve-shaped body is possible without there being any danger that the filling mass is mixed with the material

  fat applied by spraying, respectively

  spray-applied lat The subsequent filling of the various sleeve-shaped waffle bodies requires expensive handling because the different pieces have to be collected appropriately after sawing to be taken to a separate filling device provided

for this purpose.

  By the AT-PS 304 245 it is known to manufacture a paste

  hollow woven fabric filled with a waffle body

  sleeve shape by wrapping around a winding mandrel

  continuously and with a soft waffle ribbon

  out of the oven, to form a body shaped oven-

  endless drum which, by a longitudinal piercing of the winding mandrel, is completely filled with a substance of the cream type and which is sheared, before the hardening of the

  substance, respectively of the sheath-shaped body itself

  In order to make the lateral sealing of the barrel-shaped body, the different turns of the waffle strip are exposed to steam on their covering surfaces before this covering, so that they stick to each other. the other or are welded under pressure to one another The waffle strip which is used in this case

  contains between 30 and 60% of sugar, glucose or

  malted rations which, under the influence of moist heat, quickly go into solution and become tacky On this known hollow pastry it is not intended to coat the inner face of the waffle body in the form of a sheath so that such masses which do not soften the waffle band and thus reduce the strength and claudness of the

waffle body.

  Since the filling of the hollow pastry is done immediately after the wrapping of the

  waffle, and this is done through the winding mandrel

  a coating of the body in the form of a sheath

  before it is filled, in order to apply, for example, a

  insulation between the filling mass and the body of

waffle, is totally excluded.

  AT-PS 327 129 discloses a manufacturer's spe-

  cation of a hollow pastry destined to contain a soft filling, in which a pastry ribbon is coated on one side with a layer which isolates it from the filling mass, for example chocolate, and which is this layer directed inwardly, it is wound continuously and spirally with overlap on a winding mandrel to form an endless body in the form of a sleeve Thus the turns of the pastry are glued one to the other on areas covered by the chocolate layer The insulating layer is applied by spraying or spraying

  or by pouring on the pastry ribbon In the pastry

  Thus, in this device, the choice of the substances applicable to the pastry ribbon is applied to the filling material by the central longitudinal bore of the winding mandrel.

  essentially limited to sprayable substances, vapors

  These substances can be easily or releasably circulated at room temperature or can be heated to this state. On this known device, it is true that

  possibility that the air added to make the masses

  riseable or vaporizable substances can escape and heat-liquefiable masses need only be heated until they can be poured, but

  applied masses must still be sufficiently elastic

  after their application to remain adherent to the pastry strip during the subsequent winding of the pastry band, or to be able to deform with the curvature of the pastry band Moreover, these substances must retain sufficient adhesion during winding the pastry strip in order to

  stay glued on the outside of the pastry band.

  Moreover, the substance applied must maintain itself

  even the sealing of the insulating layer during the discharge of the layer caused by the winding operation This is effected for example for substances liquefiable by heat by contact with the outer side of the strip.

  pastry still hot to the extent that the temperature

  of the pastry band is sufficient.

  substances already at working temperature

  of the winding device are not vaporizable, dispersible or castable, or that do not melt in contact with the pastry band are not suitable for

  this kind of application of a coating.

  The object of the invention is to eliminate the drawbacks

  and the shortcomings that have just been described.

  This problem is solved according to the invention by a method of manufacturing a hollow pastry coated at least partially with a layer on its inner face and filled

  possibly at least partially, in which a ban

  of waffle still having the soft consistency of the outlet

  oven is rolled continuously, helically with

  on a mandrel so as to form an endless body in rotation having the shape of sheath, and that this body is

  coated on its inner side with a mass appropriate to the con-

  human summation, and that it is cut into pieces of determined length, the coating mass being fed through the mandrel towards the free end thereof and applied in the area thereof to the inner side the body in the form of a sheath, this method being characterized in that one or more masses in the pasty state or liquid Qu enductible

  are deposited on the inner side of the oven-shaped body

  water through one or more openings provided on the front face of the mandrel or, seen in the direction of transport of the barrel-shaped body, behind the end of the mandrel and / or can exit through one or more openings provided on the periphery of the mandrel. chuck, or in the transition zone between the front face and the periphery of the mandrel, and that eventually the mass or masses are distributed, after having met the internal face, on at least a part thereof, and that optionally a runoff product to be applied to the latter and / or a filling product to be introduced into the barrel-shaped body is fed through the mandrel, or

well an extension of it.

  By the method according to the invention it is possible to avoid any

  unwanted dence on the hollow space of the barrel-shaped body, or the cutting device, because there is no spraying applied masses and therefore no fog in the internal space of the body in In addition, it will be possible to apply

  process according to the invention in addition to liquid substances,

  which are not liquefiable under the influence of

  If, by means of the process according to the invention, substances which have a melting point above the temperature of the pastry strip during the winding operation are applied to the pastry strip. these substances only have to be heated to the point o,

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  when they are applied, they are just slimy.

  The application is facilitated according to the invention by the fact

  after having encountered the internal face, the mass is

  part on the inner side By the distribution of the applied mass is obtained an intimate contact thereof with the pastry band The consistency of the mass to be distributed is chosen in such a way that the forces necessary for its

  distribution on the inner side of the body to be wound up does not

  no damage to the wound body.

  Furthermore, the invention allows after application of a mass on the inner face of the sheath-shaped body of

  deposit a runoff product This runoff product

  For example, it is applied through the mandrel to the still tacky coating mass, which increases the roughness.

  surface of the inner face of the body in the form of

  coated water which ensures a better holding of a filling mass introduced eventually later in the

  baked pastry As a runoff product

  preferably used, crystallized sugar, crumb

  crushed nuts or crunchy rice can be used

  But also runoff products in the form of powder such as powdered sugar or the like

  can be deposited on the coating mass.

  On the other hand, the method according to the invention makes it possible

  troduce the filling mass through the same mandrel

  inside the barrel-shaped body before that

  it is cut into separate pieces, a layer of separa-

  If necessary, the insulating strip between the pastry strip and the filling material is already applied to the inner face of the barrel-shaped body. Thus, cutting of the isolated pieces from the endless sheath-shaped body immediately results in a hollow pastry. finished, internally coated and filled which has only

be packed.

  By coating the sheath-shaped body already

  In the case of a waffle strip, the fastening in position of the rolled pastry strip can be carried out by welding the latter, for example by steaming the coating areas of the turns of the wrap. band, so that the mass applied to the inside does not exceed

  not as high as those

  For example, the method according to the invention makes it possible to reduce the quantity of the coating layer applied to the minimum necessary, for example when rolling up a layer applied to a pastry strip with it.

for insulation.

  According to a variant of the process, the mass or masses

  of the opening or openings provided on the front side on the mandrel or, in the direction of advancement of the barrel-shaped body, behind the end of the mandrel essentially descend only by the action of gravity This variant of the process has advantages in particular for liquids which are easy to liquefy, avoiding

  spraying, or a dispersion of the masses.

  According to another variant of the method, the pressurized mass (s) is extracted from the opening (s) provided for.

  on the circumference of the mandrel, a pressure which causes

  radial transient tion of the barrel-shaped body which corresponds at most to the value of the thickness of the layer to be applied. Therefore, it is also possible to apply a mass which can only be sponged or which is pasty on the one hand , thus requiring a high discharge pressure, on the other hand it is possible to obtain a regulation of the thickness

  of the layer to be applied simply by changing the pres-

  discharge pressure and hence the outlet pressure.

  Furthermore, the invention proposes a device for carrying out the method, comprising a winding device coordinated to at least a part of the mandrel, a device for continuous feeding of the pastry band to the device.

  : 'e: - tcol rn & t, i :: A' imenzaticn in mass C end UC-

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  with at least one channel passing through the mandrel

  the free end of the mandrel and comprises at least one outlet opening and a cutting device of the

  sheath-shaped body in three pieces, which is

  characterized in that the outlet opening (s) are

  arranged on the front face of the mandrel or on

  and / or on the periphery of the mandrel, or in the passage zone thereof, the outlet opening or openings have a section which prevents the spraying of the mass, that an introduction device

  the filling mass is also provided and that it

  a channel which passes the mandrel or any extensions thereof, which is arranged separated from the supply channel (s) from the coating product and whose outlet opening (s) seen in the direction of the casing-shaped body is located behind the aperture or apertures for the coating product, a delivery device being optionally provided in this channel for the filling compound and provided, where appropriate, for the filling material. least a device for distributing at least a portion of the coating product or products after their application on the

  inner face of the body in the form of a sheath.

  This configuration allows the outlet openings to be disposed in the immediate vicinity of the region of the barrel-shaped body on which the respective coating material is applied. In addition, the device according to the invention also makes it possible to introduce the masses of fillings such as these are introduced in the most favorable position to the introduction operation in

  the inside of the body in the shape of a sheath.

  Another advantage of the device according to the invention is constituted by the device for discharging the mass of

  filling provided inside the channel of the filling mass

  wise; it also makes it possible to introduce into the body in the form of sheaths filling masses which are not

___ M

  transported with difficulty The discharge device

  the filling mass can be equipped according to the invention.

  of a clean control, independent of the control of the winding device, or of the mandrel driven in all cases, which allows to adjust the delivery device of the filling mass with respect to the volume delivered and the delivery rate irrespective of the winding speed of the pastry belt, or the speed of application of a coating product in accordance with

  the optimum requirements of the product in question which is trans-

  door. In another embodiment of the invention, the outlet openings in the form of circular grooves, slots or holes are placed on the coating section which, in the direction of advance of the barrel-shaped body , is connected to the winding section of the mandrel This conformation allows a very compact construction mode of

the entire device.

  The coating section of the mandrel may be constituted according to the invention as a self-contained head. As a result, a simple modification of the mandrel according to the invention by which by

  example, the possibility of applying a mass to the possibility

  of several masses is made possible by exchanging one coating head for another, the mandrel having

  in its winding section all the channels that are required

  as well as to the other coating head.

  Furthermore, the invention provides at least one tube

  which passes through the mandrel in the longitudinal direction.

  This tube can be used for the passage of the filling mass and does not participate in the rotation of the mandrel This tube can be implanted in a bore of the mandrel which surrounds the tube from all sides or the gap between the outer wall of the tube can be used and the inner wall of the bore as a channel

  of the coating product or the mass of

pleating.

  In another embodiment of the invention, the mandrel is formed in a sleeve against the inner face of which the implanted tube is applied almost completely.

  the mandrel and which consists of a material that is bad

  heat conductor; the tube has on the outer face of the section applied against the inside of the sleeve one or more plates or one or more grooves which constitute with the sleeve one or more supply channels of the coating mass and which are connected to the or at the outlet openings provided in the sleeve for the coating mass, while the bore of the implanted tube constitutes the passageway for the filling mass. By means of this embodiment of the invention, it is possible to introduce the inside of a pastry ribbon rolled into a shaped body

  of a sheath, a filling mass which, when filling

  of a sheath-shaped body requires a certain amount of time.

  which may be above or below the temperature required for the winding operation without the optimum temperature for the filling operation being influenced by the optimum temperature of the pastry ribbon

  for its winding, or for the operation of

  duction. If the temperature at which the pastry strip is wound is significantly higher than the temperature of the filling mass, the mouth of the tube thermally

  insulation will be rationally removed from the openings

  of the coating mass in order to allow the cooling

  pastry ribbon already rolled into a sheath-shaped body before the cold filling mass meets the internally coated pastry ribbon

and wound into a tube.

  Another feature of the invention provides that at least one section of the mandrel is constituted by two tubes

  concentric between which the food channel is formed.

  the inner tube protruding from the end face of the outer tube and carrying at its free end a flange which constitutes, with the front face of the outer tube, an annular outlet opening for the coating mass. that the passage section of the feed channel can be important, allows to convey large quantities of coating mass per unit time through the mandrel which allows to achieve a very high production speed of a sheath body

  When the wall thickness is sufficient

  weak, we can route through the interior of the

  inner tube of the filling product in sufficient quantities

  elevated-for the high speed of body production

in sheath.

  According to the invention the outer tube and the inner tube can rotate relative to each other, which allows a

  fill the hollow pastry with an internal immersed tube

  However, the inner tube may also have a greater number of revolutions than the outer tube, so that by the part of the coating head which follows the outlet opening or openings of the mass of coating, we obtain a distribution of the mass

  Another feature of the invention is

  inside the channel for the product of replacement

  pleating, depressions and elevations are provided on the channel wall. Thus, in particular for a filler capable of streaming, an advance of the latter through the wall of the channel, while the transport speed is obtained. for the filling product, if the channel wall is constituted by the inner wall of the inner tube and the latter can rotate relative to the outer tube, can be chosen independently of the winding speed

chuck.

  In another embodiment of the invention, a feed worm is mounted in the channel of the filling product, the latter being preferably driven independently of the mandrel. This arrangement makes it possible to choose

  depending on the nature of the filling product, the volume of

  the speed of feeding, or

  the discharge pressure of the filling product

  ge By the independent control of the mandrel, these parameters

  can be adapted in each case to the production speed

  In addition, when changing the filling product, only the feed screw is to be exchanged in order to obtain also for a filling product.

  wise quite different, -fine filling conditions.

  In what follows, the invention is explained by means of the example

  filled with a hollow pastry, for the manufacture of which a waffle ribbon is used as a pastry band

  soft consistency at the end of the oven

  The invention is not limited to the use of a waffle dough pastry strip. Thus, besides low sugar waffle dough and high sugar waffle dough which in the soft state of wafer out of the oven give a strip of plastic pastry, we can use other

  pasta that can be made into endless ribbons.

  The drawings show examples of

  DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a schematic side view of a first embodiment of the device according to the invention, in FIG. 2 a section along the line II-II of FIG. figures

  3-5 other embodiments of the device according to the invention.

  FIGS. 6a, 6b, 7, 8a, 8b, 9a, 9b and 10 different embodiments of the mandrel according to the invention, or of its application section, these mandrels are shown in longitudinal section. only in each case

  coating material on the inner face of the hollow body

  1a and 11b another embodiment of a mandrel according to the invention by means of which up to three different coating masses can be applied, on

  FIGS. 12a and 12b show another embodiment of a man-

  Drin according to the invention allowing the application of only one mass of enductior, in Figure 13 another embodiment of the mandrel according to the invention by means of which one or two different coating masses can be applied FIGS. 14, 15 a, 15 b show two embodiments of the mandrel for applying two different coating masses, in FIGS. 16 a, 16 b, 17 a, 17 b, 18 a, 18 b, 19, 20, 21a, 21b, 21c, 22, 23a, 23b, 23c, various embodiments of the mandrel by means of which, in addition to the coating of the inner face of the body by sleeve, it is still possible to introduce inside this body a filler or trickle, in FIG. 24 a section for coating a mandrel constituted by several sleeves

  concentric products for the application of two masses of

  ducting and the introduction of a filler or trickle into the interior of the tubular body, in Figure 25 an embodiment of the mandrel with two coating heads for the application of two coating masses ,

  in FIGS. 26a, 26b, 27a, 27b, two other forms of execution.

  the mandrel according to the invention with a heat-insulating core, and in FIGS.

  through four different forms of execution of

  hollow cells made according to the invention.

  In the example shown in FIGS. 1 and 2, a

  pastry ribbon 1, for example a waffle band consisting of

  The soft pressure at the furnace outlet is fed to a mandrel 2 which is biased in relation to its axis of rotation and is

  supported by a cylinder of advance and support 3, also com-

  against the winding section 4 of the mandrel 2

  cylinder of advance and support 3 is mounted with its parallel axis

  it is connected to that of the mandrel 2 which rotates and has on its circumference a thread that prints a movement in advance to the waffle strip fed at an angle to the axis of the mandrel 2 The mandrel 2 is followed by a cutting device 5 which serves to cut the pastry strip 1, wound in

  body in the form of a sheath This device can be a

  or a circular saw which turns, or any other

  Such a positive device of the winding device constituted by the support cylinder 3 and the mandrel 2 is fed to the baking tray 1, for example from a continuous waffle baking oven, and is wound by the winding device around the mandrel in a sheath-shaped body

  which is pushed forward along the mandrel and rotates simultaneously

  In order to adhere to one another the overlapping edges of the pastry strip formed into waffle strips, it is possible, for example, to arrange the mandrel 2 tangentially.

  steam spraying nozzle 6 which submits the

  Covering the waffle band with the action of the steam before winding (Figure 2) Steam may also be applied to the pastry strip 1 by continuously feeding a small amount of water onto a heated sheet or the like placed under the pastry strip A winding section 4 of the mandrel 2 is connected, directed towards the free end, a coating section 9 which, in the region of the free end of the mandrel, presents on the periphery The groove is defined in the direction of the free end of the mandrel by a calibration shoulder 38 whose diameter is smaller than the outside diameter of the mandrel by a value which corresponds approximately to the diameter of the mandrel.

  double the thickness of the layer to be applied The mass of

  The duct 56 is fed to the circular groove 10 through radial channels 35 from a feed channel 36 at

  center of the mandrel 2 The coating mass 56 fills

  the circular channel formed by the annular groove 10

  appears with the barrel-shaped body 39 and is brought

  therefore, all around the mandrel in contact with the

  this inner body of sheath body 39 This detaches, due to its relative movement relative to the mandrel 2, the lining mass which adheres to its inner wall The shoulder of

  calibration 38 removes excess mass from the wall

* dull body-shaped sheath 39, so that the neck

  applied to the latter has a thickness which

  corresponds to the annular slot which remains between the barrel body 39 and the calibration shoulder 38. The cylindrical conformation of the calibration shoulder 38 generates a

  cylindrical internal surface of the coating of the body in furnace

water 39.

  To make additional ribs that leave

  radially from the coating of the inner wall to the interior

  the calibration shoulder 38 can be provided with axial grooves which correspond to the desired cross-section.

  ribs If the internal coating has to

  pressure in the form of grooves, it is provided on the shoulder

  calibration 38 corresponding prominent ribs.

  In the exemplary embodiments shown in FIGS. 3 to 5, the coating section which is connected to the winding section 4 of the mandrel 2 also has an annular groove 10 on the periphery of the mandrel.

  ring are directed from the feeding channels Il which

  pour the mandrel in the longitudinal direction, for the coating mass to be applied on the inner face of the barrel body The feed channels 11 in the packing mass pass through the winding section 4 of the mandrel 2 in its marginal portions and open out Laterally in the annular groove 10 The feed channels start from a collector channel 12, placed behind the cylinder 3, which reaches

  the coating mass via a pipe 13, connected to a

  or a pump (not shown) The mandrel 2

  a central bore 7 which passes entirely through the man-

  2 and by which filling product 8 is introduced

  duit into the inside of the body in sheath.

  In the opening of the bore 7 which is in the part

  rear of the chuck 2 opens a channel 15 which starts from a reser-

  see 14 for the filling product and in which opens

  coaxially with the mandrel 2 a blowing nozzle 16 (Figure 3).

  By the blowing nozzle 16 of the filling product

  tible to run off coming out of channel 15 is blown through

  the bore 7 in the interior of the barrel-shaped body.

  In this way, a partial filling of the barrel body is obtained. If the product liable to runoff is only to be deposited very sparsely on the inner side of the coated sheath body, it will be possible to usefully provide a bore 7 which tapers towards the liner. front end of the mandrel

2 (Figure 20).

  According to another exemplary embodiment (FIG. 4), a helical feed screw 17 can be mounted in the bore

  which passes through the mandrel 2, screw to which the product of replacement

  pleating is brought from the reservoir 14 The feed screw

  17 terminates on the front end of the mandrel 2 and is controlled at the rear end of the mandrel 2 through the shaft of the screw This embodiment can be used for both a mandrel ordered as for a fixed mandrel, since the amount of product of

  required filling in each case can be adapted, inde-

  from the mandrel, by means of the speed of the feed screw It is however possible to operate with a stationary feed screw in which case the feed rate affects the quantity of feedstock.

filled deposit.

  As is apparent from the embodiment shown

  in FIG. 5, it is possible, with a mandrel 2 which rotates, to use

  this rotation for the transport of the filling product

  wise through the central bore 7 of the mandrel 2 In order to

  To improve the driving effect of the filling product, isolated helical ribs 18 have been provided on the wall of the bore 7, which can also constitute a single

continuous rib.

  FIGS. 6 to 11 show different embodiments of the mandrel 2, the coating sections 9 of which allow each time only the deposition of a coating mass

  on the inner side of the body in sheath.

  The exemplary embodiment according to FIG. 6 differs as regards the mandrels from those of FIGS. 3 to 5, only in that the central bore for the filling product is missing. The conformation of the coating section

  9 of chuck 2 is the same for these four examples of execu-

  The coating section 9 has in all cases a section limited on the one hand by the front face of the mandrel 2 and the annular groove on the other hand, whose diameter is the same as that of the mandrel 2 In this conformation of the coating section 9, during the application of the coating mass, it is introduced into the annular groove under a pressure such that the barrel body is expanded

transiently locally.

  In the embodiment shown in Figure 7, the mandrel 2 has on its coating section 9 a tapered flange 33 On the outer periphery of the mandrel 2 are provided

  in the transition zone from the cylindrical part to the

  taper 33, four outlet apertures 34,

  distributed regularly around the perimeter of the chuck and

  The outlet openings 35 are in the form of slots oriented in the longitudinal direction of the mandrel, a part of the slot being on the part of the mandrel.

  cylindrical mandrel and a portion on the taper.

  Due to this conformation, the coating material fed by the channels 35, 36, partially leaves on the front face of the mandrel and partially around the periphery of the channels 35 Depending on the thickness of the layer to be applied, the angle of slope of the cone or the outlet openings are further moved in the cone-stripped portion 33 By this embodiment is applied from each outlet opening a helical stripe of coating mass on the inner face of the body. sheath The slope of the helical band or helix is determined by the ratio of the rotational movement to the advance movement

  of the barrel-shaped body, relative to the mandrel 2 immo

  According to the slope of the helical strips and the length of the apertures 34 measured perpendicular to the slope, four helical strips separated from each other or, (FIG. at high speeds of advance of the barrel body and a relatively small twist compared to the mandrel), four helical strips which overlap by

their edges.

  If the mandrel rotates synchronously with the barrel-shaped body, longitudinal strips parallel to one another are formed on the inner surface of the barrel body. The exit openings of the coating mass may also be slits 40 oriented at an angle to

  the axis of the mandrel and which open at the periphery, respectively.

  also partly on the front face of the mandrel.

  In the embodiment of FIGS. 8 a, 8 b, the slot is arranged in such a way that its ends 41 located

  around the mandrel are on an inclined straight line

  with respect to the axis of the mandrel, whereas in the embodiment of Figure 9a, 9b, the ends 41 of the slot

  lie on a line perpendicular to the axis of the mandrel.

  By their bottom, the slots are in communication with one

  supply channel 36 in the center of the mandrel 2 This

  Mation allows large flows of coating mass.

  In the exemplary embodiment shown in FIG. 10, the coating section 9 has outlet openings 19

  disposed on the front face of the mandrel and which are in

  communication by feeding channels 1 l in coating mass (s) with one or more feeders

  constituted by the supply line 13 and the collector channel

  By these outlet openings the mass or masses of

  on the front face of the mandrel, depending on the consistency of the packing material, sprayed thickly onto the inner face of the hollow pastry or

  pressed in the form of a coil on the inner side of the paste.

  Hollow weaving As soon as the essentially fluid mass meets the inner face of the sheath body, it is distributed as a result of its liquid state and, depending on the speed of advance of the sheath body in the axial direction, constitutes a coherent layer or several helical stripe strips, which only partially blend or are

  completely separated from each other.

  With a stationary mandrel, the coating mass meets

  because of gravity, essentially the part of the inner wall of the sheath body at the

vertical below her.

  For example, if several layers of different coating

  annuities were to be deposited, one above or one

  side of the other inside the sheath body, the man-

  Drin 2 may, according to another embodiment, have several axial channels, which open on the front face of the mandrel In order to ensure a secure separation of the different coating masses, the various channels open into extensions that exceed the front end of the mandrel, the spacing of the different orifices of the front face of the mandrel being different These extensions that exceed the

  front face of the mandrel can be constituted rationally-

  However, it is also possible for these extensions to be made up of tubes which are made of holes in the drills of the mandrel coating section.

  pass through a sleeve-shaped mandrel

  pass with different lengths the front end

mandrel (Figure 12).

  According to another exemplary embodiment, the outlet openings 19 are placed on the front face of the mandrel, in a circular zone 20 close to the periphery of the mandrel A

  connected to the front of the man-

  Drin 2, an extension 21 which protrudes from the front face of the mandrel 2 and which, by its delimiting surface directed radially outwards 22, is connected to the outlet openings 19. By the delimiting surface 22, the lining mass exiting outlet openings 19 is maintained in the immediate vicinity of the inner side of the sheath body

  which slides along the periphery of the chuck 2, which leads to

  do a regular layer deposition of the coating mass on

  the inner face of the body in sheath (Figures 11a, b).

  On a chuck 2 immobile or which turns only slowly,

  the delimiting surface 22 formed on the surface of cylinders

  dre and provided with the need for depressions that connect to the outlet openings 19, avoids premature descent of the packing mass rod that leaves the opening of

respective output 19.

  With a mandrel 2 in rotation, the delimiting surface of the extension on the front side favors the distribution of the rolls of coating mass which come out of the different

  outlet openings 19 in a regular uninterrupted layer.

  Furthermore, this embodiment makes it possible to keep the relative speed of the coating mass at a low value, when it is released on the front side of the mandrel, with respect to the barrel-shaped body. Thus, the mandrel may, for example, rotate with substantially the same angular velocity around its axis as the body in sheath wound on the

  Thus, there is only a long movement

  dinal between the barrel body and the mandrel, so that the coating mass, when it meets the inner face

  the body sheath, only has to be rotated.

  The distribution of the outlet openings 19 on the circular ring-shaped zone 20 and the delimiting surface 22 of the extension 21 ensure a regular layer thickness.

  on the periphery of the inner side of the body in sheath.

  The extension 21 can be a holding with the mandrel

12328

  2 But this extender can also be a plug mounted

  in a hole in the mandrel 2 (Figure 11a).

  A conformation of the extender 21 on a closure plug 23, which closes a bore 7 which passes through the mandrel 2, the feed channels it opening into outlet openings 19 on the frotnal side, outside the closure cap 23 , mandrel 2, allows use

varied mandrel.

  When the closure cap 23 is put in place, it is possible by means of the mandrel 2 to coat the inner face of the barrel body through the outlet openings 19 arranged on the front face of the mandrel without introducing the

  filler within the barrel body.

  If, on the other hand, the closure cap 23 is exchanged for a plug which has a bore which passes through it, it is also possible, with the same mandrel 2, to introduce

  filling inside the barrel body.

  In another variant (FIG. 13 a, b), the closure cap 23 is exchanged against a coating head 24, the feed channels opening into an annular groove 26 which is formed between the front side of the mandrel 2 and a shoulder 25 of the coating head In the shoulder 25 which decreases towards the free end of the coating head 24 is formed another circular groove 27 which is connected by radial channels 28 to a blind hole 29

  which is the extension of the bore 7 in the mandrel.

  Drilling 7 of mandrel 2 is now a feed channel.

  for a second coating product which is

  than through the annular groove 27 on the first coating mass already applied through the annular groove 26

  on the inner side of the body in sheath.

  During this operation, the layer thickness of the first and second coating masses is determined on the one hand by the largest diameter of the shoulder 25, or its decrease towards the free end of the shoulder. the coating head 24, and secondly by the pressure accumulated in the coating masses of the grooves

rings 26, or 27.

  In another variant of a coating head, a

  din 30 is connected to the shoulder 25, the channels

  31-in communication with the bore 7 of the man-

  Drin 2 having their openings 19 on the front side 32 of the step 30 (FIGS. 15 a, b) In this case, a coating mass is released by means of the application head, through the annular groove 26 on the around the chuck 2,

  while the second coating mass comes out through the openings

  output tails 19 frontally of the mandrel 2, or

of its coating section.

  In the exemplary embodiment shown in FIGS.

  b, the outlet openings 34 are arranged analogously

  7, but the feed channels 35 are oriented axially in the vicinity of the periphery so that

  at each exit opening 34 leads a food channel

  Of course, only a single mass can be passed through the supply channels 35. In order to be able to introduce into the shell body coated on its inner side also a filler or trickle, it is intended for those a bore that

  crosses the chuck 2, or a channel 37.

  In the example of execution of figure 17 a, b, the opening

  output, similar to that of Figures 8a, b is

  Constituted by a slot 40 whose ends 41 which are

  wind on the periphery of the mandrel are situated on a line inclined with respect to the axis of the mandrel, whereas in the embodiment of figs 21a, b, c the outlet openings, in a manner similar to that of the figures 9 a, b, have the form of slots 40 whose ends 41 located on the

  around the chuck are located on a straight line

  To these two embodiments, there is provided in the mandrel 2, a central passage channel 42 for filler or trickle, the bottom of the slot being separated from this channel by a wall (FIGS. 17b, 21b) and the feed channels 35 opening into the side walls of the slots 40 (FIGS. 17a, b, and 21a). On the examples of execution of FIGS. 8 a, b and 17 a, b

  the slots 40 open out around the mandrel, opening it

  the slots 40 extending over half of the periphery of the mandrel. In the embodiments of FIGS. 21a, b, c, 9a, b, the slot 40 extends to a step 43 directed towards the front part of the mandrel 2, a part of the slot opening being open towards the anterior end

mandrel 2.

  In place of several feed channels 35 arranged peripherally in the mandrel 2, which open into the walls of the annular grooves or slots, the supply of packing mass can be effected by a single channel defined by cylinder walls coaxial

19 and 25).

  This channel may be formed between an outer tube 44, on the outer side of which slides the barrel-shaped body, and a coaxial rod placed inside the tube.

  and protruding from the free end of the outer tube and

  carries a flange located outside this tube, this collar constituting together with the front face 47 of the

  outer tube 44 an annular exit opening

  Rette 46 of this rod constitutes the calibration shoulder

  for the filling operation in a coating mass.

  The cylindrical rod itself may include a longitudinal bore which serves as a feed channel to a coating head attached to the free end of the rod.

  of this embodiment (Figure 14) two masses of

  One of the coating masses is applied through the coating head 48, while the second coating mass exits through the throat.

  ring formed between the front face 47 of the outer tube

  dull 44 and the coating head 48.

  Alternatively, the embodiment of FIG. 14 may also be used for the application of a single coating layer by means of the coating head 48, in which case the coating head is rotated independently of the coating head. mandrel 2 By the rotation of the coating head a distribution of the coating mass takes place and thus the irregularities that occur with the head are avoided

immobile coating.

  For the coating of the sheath body and for the introduction

  Ducting of a filler or trickling agent therein, in the embodiment examples of FIGS. 19, 22 and 23 a, b, c, in place of the rod, an internal tube has been mounted.

in the outer tube 44.

  The inner tube carries at its free end a glue

  rette 46 which again constitutes, with the front face 47

  the outer tube 44 the coating section of the mandrel

  wise of the inner tube 45 which serves as a supply channel for the filling product or runoff In this channel

  power supply can be mounted

  dale 17 for the filling product, or

  LEMENT. According to another embodiment, the inner tube 45

  is equipped on its inner side with a helical rib

tinue (Figure 23 a, b, c).

  In the embodiment shown in FIG. 24,

  the coating section 9 of the mandrel is constituted by several

  a plurality of concentric tubes which surround feeding channels in each case In the outer tube 44 is mounted the inner tube 45 equipped with the coating head 48 The coating head 48 is constituted as a cylindrical flange which extends beyond the inner tube 45 and which comprises

  a circumferential groove between its two frontier surfaces

  49 which communicates by radial channels with the inside of the inner tube 45 In addition it is mounted in the coating head 48 another concentric tube

  from the anterior frontal side of the head of

  48 and constitutes, together with the inner tube, the supply channel of the coating mass

  that is taken out of the coating head

  dull 50 serves as a filling channel for the product-

  filling or trickling or it is used as supply channel of the coating mass for another coating head 48 '(Figure 25) The front end face of the first coating head 48 together with the face frontal 47 of the outer tube 44 another annular groove for the outlet

a coating mass. On the exemplary embodiments shown in FIGS. 27 a, b, 26 a, b,

  the mandrel is constituted by a cylindrical sleeve 51 with a frame in the form of

  tube 52 which is sealingly supported against the

  In the circumference of the tube-shaped frame 52 a flat 53 is

  with the inner wall of the sleeve 51 a feed channel

  This channel, like the flat, ends in the region of the front face of the sleeve 51. Immediately after the end of the plate 53, a ring 54 is disposed on the mount 52, this ring constitutes with the front face the sleeve 51 a circular groove in which laterally opens the channel formed by the plate 53 This channel may also be constituted by one or more grooves provided on the periphery of the frame, however the plate has the advantage over the longitudinal groove that the contact area between the coating material conveyed in the channel and the heat-insulating material is lower than

  the contact surface between the coating mass

  mined in the channel and the tube 51 which constitutes the mandrel.

  Therefore, it is ensured that the supply of heat into the coating mass by the winding mandrel is greater than the heat removal through the insulating material. The frame 52 may be made of heat insulating material and end very far away from the annular groove 55 This is the case for example during the

  filling of a body in the form of a sheath, wound up

  shot of a waffle band, with ice cream.

  The waffle band is protected from moisture by a material

  riau, for example chocolate, which is applied through

  the annular groove 55 on the inner face of the body by means of

  and the internally coated body is cooled so that the mass of ice transported through the tube-shaped mount 52 meets a wafer body which, relative to the winding operation, is colder and completely isolated. endless waffle is filled completely

  ice on a section that corresponds to the desired length

  of hollow pastry, following which this section

  is separated from the endless waffle body.

  In Figures 28-31 there are shown some examples of pastry prepared by the method -according to the invention

in longitudinal section.

  FIG. 28 shows a rolled wafer rolled up from a waffle strip, the inside of which has been coated with a layer of chocolate 56. This chocolate layer 56 may, according to the invention, be applied in one time on the total circumference of the inner side of the hollow crescent In alternative we will be able to deposit several helical lines of chocolate which complement each other in a uniform layer Simultaneously the different lines of chocolate

  may consist of different masses of chocolate.

  However some of the helical lines may

  also be constituted by a mass of fatty glaze.

  Moreover, it is possible to leave part of the

  inner surface of the rolled wafer without coating.

  According to one variant of the process according to the invention, only narrow strips or mass strands are deposited on the internal face of the rolled wafer. These strips can be

in a helix and cross.

  Chocolate strips or chops of mass can also be deposited parallel to the longitudinal axis

rolled wafers.

  In FIG. 29, there is shown a rolled wafer 57 on which a substance 58 with one or more layers of chocolate or fatty glaze has been deposited, a substance of

  runoff 8 such as nuts, crisp or the like.

  Before the deposition of the runoff product 8, it can also be deposited on the layer of chocolate or icing

  fat, jam in separate strips.

  In FIG. 30, there is shown a rolled wafer 57 coated internally, which has been filled completely with

  a mass of nougat 59, ice cream or cream.

  In Figure 31, there is shown a rolled wafer 57 coated on its inner face of chocolate, on the inner side of which nougat was deposited as a second coating mass 60

  before crunching has been applied as a product of

on the nougat layer.

  As coating masses, it has been quoted up to

  chocolate, greasy glazes, nougat or

  Of course, other substances which are

  creams up to pasty substances can be applied by means of the process according to the invention, for example

  marzipan or also a mass of caramel.

  The mandrel can be machined metal hardened surface.

  It can also be constituted by a metal sleeve to

  plastic core or be entirely

  In addition, the coating heads can be

  be made of plastic.

  The present invention is not limited, of course, not only to the embodiment examples described. It is possible to arbitrarily combine the characteristics of the different embodiments of the mandrels according to the invention and of their coating sections, without departing from the scope of the invention. Thus sections of mandrel made for example, in one piece, can be assembled from two or more pieces Moreover, the coating heads can be integral with the mandrel or be

  units that can be screwed on the mandrel.

  Moreover, each of the embodiments described

  of the mandrel according to the invention, or of its section of

  tion or its coating head will be able to find a

  use on the devices of FIGS. 1 to 5.

Claims (36)

  Process for the production of a hollow pastry coated at least partially with a layer on its internal face and possibly filled, at least partially, in which a waffle band still having the consistency   softness of the furnace outlet is wound continuously, helicoid-   dally with overlap, on a mandrel to form an endless body in rotation having the shape of a sheath, and that this body is coated on its inner face with a mass suitable for human consumption, and that it is cut in pieces of determined length, the coating mass being fed through the mandrel towards the free end thereof and applied in the region thereof to the inner side of the barrel-shaped body, characterized in that that one or more masses in the pasty state or liquid or enducible are deposited on the inner face of the body in   sheath shape through one or more openings   views on the front side of the mandrel or, in the sense of   transport of the body in the form of a sheath, behind the end   the mandrel, and / or may exit from one or more openings provided on the periphery of the mandrel, or   in the transition zone between the front face and the   turn of the mandrel, and that eventually the mass or masses are distributed, after having met the internal face, on at least a part thereof, and that eventually a runoff product which must be applied on the latter, and / or a filling product to be introduced into the barrel-shaped body is fed through the mandrel,   or an extension of it.   Method according to claim 1, characterized in that the mass or masses coming out of the openings provided on the front side of the mandrel or, seen in the direction of advance of the barrel-shaped body, behind the end of the mandrel, only come down essentially by the action of gravity.   3 Process according to Claim 1, characterized in that the mass or masses are allowed to escape through the   openings provided on the periphery of the mandrel under a pres-   which causes a momentary radial swelling of the sheath body whose importance corresponds to the maximum thickness of the layer to be deposited.   Process according to any one of the claims   1 to 3, characterized in that by application of a mass, the inner face of the sheath-shaped body is covered   partially or by application of one or more   she is covered completely.   Process according to any one of the claims   1 to 3, characterized in that by application of several masses, the inner face of the barrel-shaped body is covered partially or completely by one or more continuous layers.   6 Process according to claim 5, characterized in that the layer or each layer is constituted in all cases of several masses.   Process according to any one of the claims   preceding, characterized in that the one or more masses are   applied as spirals (s) or longitudinal bands.   Process according to claim 7, characterized in that   that the spiral or spirals are applied in Seeing themselves.   Process according to Claim 7, characterized in that the spirals or longitudinal strips are applied in   overlapping at least partially themselves.   Process according to any one of the claims   7 to 9, characterized in that at the application of the mass or masses in the form of spirals or longitudinal strips, the mass or masses of one of the spirals (longitudinal strips) are distributed, after having encountered the internal face from the body   in sheath, on a part of it.   Process according to any one of the claims   1 to 6, characterized in that for the application of a layer completely covering the inner face of the sheath-shaped body, the mass is applied simultaneously all around the inner side while possibly at least on a part of the around or along a spiral-shaped section, a portion of the layer thickness is again scraped from the inside.   Process according to any one of the claims   preceding, characterized in that after the application of the coating layer a runoff product is introduced, for example blown inside the barrel-shaped body   and that it is deposited on the coating mass.   13 Installation for carrying out the process according to one   any of the preceding claims, including a provision   winding device cooperating with at least a part of the mandrel, a device for continuously feeding the pastry strip towards the winding device, a device for feeding a coating mass with at least one channel feeding that   crosses the mandrel towards the free end of this   ci, with at least one outlet opening and a cut-off device of the barrel-shaped body in separate pieces, characterized in that the outlet opening or openings (19, 10,   26, 27, 34, 40, 49) are placed frontally or on the   turn of the mandrel (2) or on extensions of the latter,   in the zone of transit towards it, the opening (s)   have one or more sections which prevent the dispersion   of the mass, that a device possibly provided for the introduction of a filling mass also has at least one channel which passes through the mandrel (2), or the extensions thereof, and that it is arranged separately   supply channel (7) or feed channels   (11, 35, 36) in mass or coating masses, that its outlet opening or openings, seen in the direction of advance of the barrel-shaped body (39), are behind the opening or openings of outlet (10, 19, 26, 27, 34, 40, 49) for the coating material or masses, a transport device (17, 18) being optionally provided inside the channel (7) and that the case at least one distribution device (22, 38, 46, 43, 33) of at least a part of the coating material or masses is provided after their application on the inside face. dull body in sheath (39).   14 Device according to that one or more channels with an outlet opening 26, 27, 49), a slot (34, Device according to that one or more channels cun several openings of 16 Device according to the that a plurality of channels (11, claim 13, characterized in (11, 35, 36) are each equipped in the form of a ring (10, ) or a hole (19). claim 13, characterized in that (11, 35, 36) comprise each   exit. claim 13, characterized in, 36) comprise a common annular groove-like opening (10, 26, 27, 49) or slot (40).   Apparatus according to any of the claims   13 to 16, characterized in that the outlet openings con-   formed into an annular groove, slot or hole are practically   in a coating section (9) which, viewed in the direction of advance of the barrel-shaped body (39), is connected to   the winding section (4) of the mandrel (2).   Apparatus according to claim 17, characterized in that   the outlet openings in the form of an annular groove   lair, slot or hole are made in a head   coating element (24, 48) which constitutes the section of chuck ducting.   Apparatus according to claim 18, characterized in that   that for each coating mass is provided a head of   its own outlet (48, 48 ') whose outlet openings (10, 49) are connected by means of clean channels (1, 35) to channels   separate power supply of the mandrel.   Device according to any one of the claims   13 to 19, characterized in that at least one of the exit openings for the coating material or masses (19, 10, 34, 26, 40) is followed by a distribution device (22, 39, 33 , 25, 46, 43) of the coating mass coming out of this opening output (19, 10, 34, 26, 40).   21 Device according to claim 20, characterized in that the device for distributing the coating mass   has a shoulder (25, 46) disposed behind the   outlet opening (26) or, seen in the direction of advance of the sheath-shaped body, by the previous delimitation the outlet opening (34).   Apparatus according to any of the claims   13 to 21, characterized in that at least one tube is provided   (45, 50) which passes through the mandrel (2) in the longitudinal direction.   23 Device according to claim 22, characterized in that the mandrel is constituted by a sleeve against the surface of which rests almost entirely the tube which passes through   the chuck and which is made of a material bad   heat conductor; the outer side of the tube having on the section which bears against the inside of the sleeve a flat or groove which, together with the sleeve, constitutes a   supply duct in mass coating and which is in com   communication with the outlet opening (s) provided in the sleeve, while the bore of the engaged tube constitutes a   passage channel for the filling product.   24 Device according to any one of the claims   13 to 22, characterized in that at least one section of the mandrel (2) is constituted by two concentric tubes (44, 45), the inner tube (45) carrying at its free end a head   coating material (48) and the bore of the inner tube (45) being   titué in supply channel for the mass of coating towards   the outlet openings of the coating head (48).   Device according to Claim 24, characterized in that the gap between the concentric tubes is also constituted by a feed channel for a coating material, the inner tube (45) extending beyond the surface   front end (47) of the outer tube (44) and having at its end   mité libre a flange (46) which, together with the front face (47) of the outer tube (44) constitutes an opening   annular output for this coating mass.   Device according to claim 25, characterized in that in the inner tube (45) is mounted another concentric tube (50) which constitutes a passage channel for the filling product and forms, together with the inner tube   (45), a feed channel for the coating mass.   Apparatus according to claim 25 or 26, characterized   in that the outer tube (44) and the tube or tubes   dies (45) can rotate relative to one another.   28 Apparatus according to claim 27, characterized in that the outer tube (44) and the inner tube or tubes (45) are mounted so as not to be rotatable one to another.   Device according to any one of the claims   13 to 28, characterized in that the transfer device provided in the channel (7) for the filling product is constituted by depressions or elevations (18) on the channel wall. Device according to claim 29, characterized in that on the wall of the channel are provided one or more   grooves or ribs (18) helical.   31 Apparatus according to any one of the claims   13 to 28, characterized in that inside the channel (7) for the filling product is mounted one or more transport screws (17), preferably driven independently of the mandrel (2).   Apparatus according to any of the claims   13 to 31, characterized in that the different tubes are con-   by a heat-insulating material or that they are   formed so as to isolate heat.