EP2622059B1 - Unit for piercing and moulding, by means of striking, pressing or stamping, for the production of pierced shampoo bars, and method for producing such bars, particularly in such a unit - Google Patents

Description

The present invention relates to the field of manufacture of shampoo bars or other detergents or solid hygiene products such as soap and relates to a drilling and molding unit, by striking, pressing or stamping, for the manufacture of breads drilled from shampoo bungs or other detergent or solid hygiene product such as soap. It also relates to a method of producing such drilled loaves more particularly implemented by such a unit.

It is known that solid soap is generally put on the market in the form of blocks or hard breads commonly called soaps, generally of oblong, cubic, round or oval shape or thematic shapes such as animals or characters.

Such soap bars are industrially designed in a soap bar production line generally comprising a coiling unit which blends the constituents of the solid soap and, by extrusion, a coil or strip of soap exiting continuously from said unit of soap. socking.

Each bead or strip of soap is then cut, in a cutter of the die, into pieces or bungs of soap, of length determined according to the number of loaves to be made in a bung, then, the bungs coming out of the cutter are brought and placed in a molding or forming unit for the formation and finishing of soap bars in their final form.

In the field of industrial manufacture of soap bars, particularly in large production, current molding or forming processes of the latter consist essentially in pressing a soap bung between two molding dies which are closed to molding with the effect of forming and to cut the concerned bung into a loaf or a plurality of loaves of soap.

For the implementation of these processes molding units are known which each comprise at least one molding assembly composed of a first molding die and a second molding die movable relative to the other, the first matrix molding is generally movable and arranged above the second matrix which is fixed.

Thus, in the open state of the molding assembly, the first and second molding matrices are able to be spaced apart or apart from one another to interpose a soap bung between them, and closed state of the molding assembly, said molding dies are adapted to meet or to come together to be in almost complete contact with each other by press-squeezing the concerned bung which fills, by elastic deformation of its solid material, at least one impression of molding and finishing.

The or each impression of molding and finishing, which will give, by its hollow mold mark, a definitive shape to a bar of soap, is generally constituted by the cooperation, in the closed state of the molding assembly, between a first molding cavity made in the first molding die and a second molding fingerprint made in the second die casting.

Furthermore, these molding units also comprise gripping means for gripping and transferring the bars of soap for their evacuation from the molding unit to an evacuation line for their packaging or storage or to a recycling line for recovery if they are defective, each line being generally constituted by a conveyor conveyor belt.

In addition, each gripping means generally consists of a vacuum gripping plunger comprising a vacuum gripping surface intended to come into gripping contact, after reopening of the molding assembly, with a contact surface, which is usually flat. and continues, soap bar concerned which is housed in one of the corresponding first and second matrix, generally in the second matrix which is fixed.

Another commercially available detergent or hygiene product is solid shampoo or solid shower gel which is also in the form of blocks or loaves made in such channels, but whose viscosity properties generally differ from one another. solid soap.

The solid shampoo has a very favorable impact on the environment because it requires much less packaging than liquid shampoo packaged in plastic bottles incorporating more or less complex watertight opening systems. For example, it has been found that a 100 g shampoo bar represents the use of two bottles of liquid shampoo of an average of 250 ml, ie thirty times less packaging used by weight and a hundred times less packaging rejected. in volume.

However, conventional soap bars and shampoo bars have substantially identical shapes, which does not allow the consumer to differentiate them visually, especially at a glance.

A solution to this problem has been made by practicing a central and through recess, generally of round section, in each shampoo bar, which makes it possible to distinguish them from soap bars which do not generally include them. In addition, the drilling of soap bars or shampoo makes it possible to suspend them advantageously on a hook for their support before and after use.

However, these holes are currently made manually, using appropriate tools by piercing the shampoo buns coming out of the die unit of the manufacturing die. These drilling operations therefore add an additional step, moreover non-automated, in the manufacturing process, which does not allow to obtain sufficiently high production rates.

The document CN 2 460 524 Y relates to a solid body of soap (1) comprising at least one figure or a character for identifying said body of soap. Each figure or character is made from a body of colored soap (2) inserted into a perforation in the body of solid soap.

However, if the soap body of the document CN 2 460 524 Y has one or more identification marks or characters to distinguish it from those which do not contain it, it requires the manufacture of colored soap bodies of different shapes and adapted according to the marks or characters desired (s) and additional operations to insert these bodies of colored soap in the perforations provided for this purpose in the body of soap, thereby increasing their manufacturing cost.

The document CN 201 046 959 Y relates to a soap comprising a soap body traversed by one or two holes (s), preferably in the center of said body of soap.

The document JP 4,257,800 A relates to a transparent soap and a drilling method for making a hole by means of a drill bit and for casting a liquid crystal and a method for forming irregularities such as patterns or letters on the surface of the soap.

The document JP 2007 084732 A discloses a soap having a multiplicity of holes through the soap by its two large upper and lower faces so as to form a figure on said faces.

However, if the perforated soaps of the documents CN 201 046 959 Y , JP 4,257,800 A and JP 2007 084732 A are adapted to distinguish themselves from other non-perforated soaps, they remain of high manufacturing cost. In addition, the holes made in such soaps are not always of sufficient quality, that is to say that the holes have defects or deformations.

The present invention aims to overcome these disadvantages by providing a molding unit, by striking, pressing or stamping, for the production of breads pierced with one or more through holes from shampoo bars or bolts or other detergents or products solid hygiene such as soap, to automate the current drilling operations of said loaves with a reduced manufacturing cost, while obtaining a high quality holes in said loaves.

For this purpose the present invention relates to a drilling and molding unit, by striking, pressing or stamping, for the manufacture of breads drilled from shampoo bungs or other detergents or solid hygiene products such as soap outgoing an extruder and a slitter, said unit comprising at least one molding assembly consisting of a first die and a second die movable relative to each other so as to be in an open state of said set of molding, spaced apart or spaced from each other to be able to interpose, between the latter, a bung and, in a closed state of said molding assembly, to join or to get closer to be in contact almost completely with each other. the other by hugging with pressing said bung which fills at least one impression of molding and finishing of a loaf constituted by the cooperation between a first impression and a second complementary impression each made respectively in the first molding die and in the second molding die, said bungs each having two opposite longitudinal sides and being brought into said unit by means of transport means such as a transport conveyor, preferably a conveyor conveyor belt.

• en amont de l'ensemble de moulage, une station de perçage fixe ou mobile apte à réaliser dans un bondon un ou plusieurs trous traversant, de préférence alignés dans l'axe dudit bondon, et
• au moins un relief de remplissage s'étend dans la ou chaque empreinte de moulage et de finition et est susceptible de remplir, lors du moulage, le ou l'un des trous traversant dudit bondon ainsi percé de sorte à maintenir la marque lors le moulage de son ou de chacun de ses trous traversant lors du moulage, ce en vue de réaliser un ou plusieurs pains percés d'un ou plusieurs trous traversant.

Such a unit is essentially characterized in that it further comprises:

• upstream of the molding assembly, a stationary or movable drilling station capable of producing, in a bung, one or more through-holes, preferably aligned in the axis of said bung, and
• at least one filling relief extends in the or each impression of molding and finishing and is capable of filling, during molding, the or one of the holes through said bung so pierced so as to maintain the mark during molding of its or each of its through holes during molding, in order to make one or more loaves pierced with one or more through holes.

The subject of the present invention is also a process for making breads pierced with one or more through-holes from shampoo bungs or other solid hygiene products such as soap, more particularly in a drilling and molding unit according to the present invention.

• dans une première étape à pratiquer transversalement dans un côté longitudinal d'un bondon, en amont d'un ensemble de moulage d'un ou de plusieurs pains dans une ou plusieurs empreintes de moulage et de finition, un ou plusieurs perçages dans un bondon, en vue de réaliser dans ledit bondon un ou plusieurs trous traversant, de préférence alignés dans l'axe dudit bondon, puis,
• dans une deuxième étape, à remplir lors du moulage, le ou chaque trou traversant d'au moins un relief de remplissage s'étendant dans la ou chaque empreinte de moulage et de finition de sorte à maintenir la marque lors du moulage du ou de chaque trou traversant pratiqué dans ledit bondon ainsi percé, ce en en vue de réaliser des pains percés d'au moins un trou traversant.

Such a process consists of:

• in a first step to be carried transversely in a longitudinal side of a bung, upstream of a molding assembly of one or more loaves in one or more molding and finishing impressions, one or more bores in a bung, in order to produce in said bung one or more through holes, preferably aligned in the axis of said bung, then,
• in a second step, to be filled during the molding, the or each through hole of at least one filling relief extending in the or each molding and finishing cavity so as to maintain the mark during the molding of the or each through hole made in said bolt and pierced, in order to make breads pierced with at least one through hole.

• la figure 1 montre une vue schématique de dessus d'une filière de fabrication de pains de shampoing comprenant une unité de perçage et de moulage selon la présente invention, avec une station de perçage fixe,
• la figure 2 montre une vue schématique de dessus d'une filière de fabrication de pains de shampoing comprenant une unité de perçage et de moulage selon la présente invention, avec une station de perçage mobile,
• la figure 3 montre une vue schématique de profil d'un bondon de shampoing percé de deux trous traversant et intercalé entre deux matrices d'un ensemble de moulage, à l'état d'ouverture, d'une unité de perçage et de moulage selon la présente invention, dans un mode de réalisation préférentiel,
• la figure 4 montre une vue schématique de profil du bondon de shampoing percé de la figure 3 serré et déformé par pression entre les deux matrices, à l'état de fermeture, en vue de la réalisation de deux pains de shampoing perforés chacun centralement par un trou traversant issu de l'un des deux trous traversant dudit bondon percé.

The invention will be better understood, thanks to the following description, which refers to a preferred embodiment, given by way of non-limiting example, and explained with reference to the attached schematic drawings, in which:

• the figure 1 shows a diagrammatic view from above of a shampoo bread production die comprising a drilling and molding unit according to the present invention, with a stationary drilling station,
• the figure 2 shows a diagrammatic view from above of a shampoo bread production die comprising a drilling and molding unit according to the present invention, with a mobile drilling station,
• the figure 3 shows a schematic side view of a shampoo bung pierced by two through-holes and interposed between two dies of a molding assembly, in the open state, of a drilling and molding unit according to the present invention in a preferred embodiment,
• the figure 4 shows a schematic profile view of the bung of shampoo pierced by the figure 3 pressed tightly and deformed between the two dies, in the closed state, for the production of two shampoo loaves each perforated centrally by a through hole from one of the two through holes of said pierced bung.

The figures show a drilling and molding unit, by striking, pressing or stamping, for the manufacture of breads 1 drilled from shampoo bolts 2 or other detergent or hygienic product such as soap coming out of an extruder and a cutter 1 ", said unit comprising at least one molding assembly 3 and 4 constituted by a first matrix 3 and a second matrix 4 movable relative to each other so as to be in an open state of said molding assembly 3 and 4, spaced apart or spaced apart from each other so as to be able to interpose, between the latter, a bung 2 and, in a closed state of said molding assembly 3 and 4, to join or to get closer to each other. to be in almost complete contact with each other by pressing with pressure said bung 2 which fills at least one impression of molding and finishing 5 and 6 of a loaf 1 constituted by the cooperation between a first impression 5 and a second footprint 6 supplement areas each respectively formed in the first molding die 3 and in the second molding die 4, said bungs 2 being fed into said unit by transport means 13 of the transport conveyor type 13, preferably of the conveyor belt transport type 13.

• en amont de l'ensemble de moulage 3 et 4, une station de perçage 14 fixe ou mobile apte à réaliser dans un bondon 2 un ou plusieurs trous traversant 11, de préférence alignés dans l'axe dudit bondon 2, et
• au moins un relief de remplissage 12 s'étendant dans la ou chaque empreinte de moulage et de finition 5 et 6 et étant susceptible de remplir, lors du moulage, le ou l'un des trous traversant 11 dudit bondon 2 ainsi percé de sorte à maintenir lors du moulage la marque de son ou de chacun de ses trous traversant 11 lors du moulage, ce en vue de réaliser un ou plusieurs pains 1 percés d'un ou plusieurs trous traversant 11'.

According to the present invention, such a unit further comprises:

• upstream of the molding assembly 3 and 4, a fixed or movable piercing station 14 capable of producing in a bung 2 one or more through-holes 11, preferably aligned in the axis of said bung 2, and
• at least one filling relief 12 extending in the or each molding and finishing imprint 5 and 6 and being capable of filling, during molding, the one or one of the through holes 11 of said bung 2 thus pierced so as to maintain during molding the mark of its or each of its through holes 11 during molding, in order to produce one or more loaves 1 pierced with one or more through holes 11 '.

The pierced loaves 1 can be transferred from the molding assembly 3 and 4 by gripping means such as gripping cups, not shown, and brought to transport means by being deposited, for example, on a conveyor of transport 13 'tape or the like for the transport of isolated loads, for their storage ready for sale.

In a preferred embodiment of the drilling station 14, it may comprise one or more drilling tools 7 cooperating with a perforated bearing surface 10, 10 'and being capable of piercing one of the sides longitudinal 2 'of a bolt 2 bearing by its other opposite longitudinal side against said perforated bearing surface 10, 10' which is adapted to receive the or each piercing tool 7 substantially transversely traversing said bolt 2 for its drilling.

The perforated bearing surface 10, 10 'may comprise one or more slots 10' each intended to receive the one or one of the drilling tools 7 drilling at height and in the axis of the corresponding light 10 '( figure 1 and figure 2 ). In a variant, not shown, the perforated bearing surface 10, 10 'may comprise an elongate slot 10' intended to receive the piercing tool or tools 7 each piercing at and along an axis passing through said slot 10 'elongated.

Preferably, a piercing tool 7 of the or each through hole 11 may consist of a punch, a punch or a drill type for example rotary.

In a first embodiment of the drilling station 14, the latter may be stationary and may furthermore comprise stop means 8, 9 able to stop or block a bung 2 in the drilling position in the station. 14, between the perforated support surface 10, 10 'and the piercing means 7 ( figure 1 ).

In the case where the present invention provides for making several through holes 11 in a bung 2, several drilling tools 7 will be provided, one for each through 11 to be produced, and preferably arranged transversely to the direction of movement of the bungs 2.

The stop means may be composed of an actuator 8, such as a jack, actuating, for example, a stopper 9 adapted to be positioned and interposed on the trajectory of the bung 2 passing through the station piercing 14 so as to stop or block the latter opposite and against the perforated support surface 10.

It will then be understood that the stop 9 will be positioned and determined so as to be able to stop the bolt 2 concerned in the piercing position opposite the perforated support surface 10, 10 'so that the or each piercing tool 7 is in the axis of a light 10 'or, where appropriate, in an axis passing through the elongate light 10'.

In another embodiment of the drilling station 14, the latter is movable, that is to say that the assembly composed of the or each piercing tool 7 and the perforated support surface 10, 10 'is capable of being controlled in displacement parallel to the axis of displacement (D) of the bungs 2 when one of them is in the drilling position between the bearing surface 10, 10', opposite of the latter, and the drilling tool or tools 7 being detected by detection means 15, for example photoelectric position sensors, in order to make one or more holes in the bung 2 concerned in support of and to the same speed as the latter ( figure 2 ).

The or each drilling tool 7 can be driven in drilling displacement by means of an actuator 7 'and the perforated bearing surface 10, 10' can be produced by means of an elongate rigid piece 10, such as for example a plate or a plate, having or being traversed by at least one orifice or a light 10 'able to receive the drilling tool or tools 7 passing through the bung 2 concerned.

The assembly consisting of the drilling tool (s) 7 and the bearing surface 10, 10 'can be advantageously mounted on a support mobile 16, preferably common, capable of moving in translation parallel to the direction of movement of the bungs 2, rectilinearly ( figure 1 and figure 2 ) or curve, if any.

If we now refer to the figure 3 it can be seen that at least one pair of filling reliefs 12 can extend into the or each molding and finishing imprint 5 and 6 of a bread 1 and be composed of a first filling relief 12 fixed on the bottom 5 'of the first cavity 5 and a second filling relief 12, preferably of identical length to said first filling relief 12, fixed on the bottom 6' of the second cavity 6. This so that, during the molding in the closed state of the molding assembly 3 and 4, the first and second filling reliefs 12 of the or each pair of filling reliefs 12 extend into the mold and finish imprint 5 and 6 corresponding in the axial extension and vis-à-vis one of the other being adapted to be inserted each into the or in one of the through holes 11 by filling the latter together, possibly with a game of centering, so as to maintain, during the molding, the mark of the transverse hole t 11 in the or each bread 1 out of the molding assembly 3 and 4 corresponding.

In a variant, at least one filling relief, fixed on the bottom 5 'of the first recess 5 or the bottom 6' of the second recess 6, extends in the or each molding and finishing imprint 5 and 6 d a roll 1 so that, in the closed state of the molding assembly 3 and 4, the or each filling relief extends into the molding and finishing cavity 5 and 6 corresponding to being able to to fit into the or in one of the through holes 11 by filling, possibly with a centering game, the latter to maintain, during molding, the mark of the through hole 11 in the or each bread 1 out of the molding assembly 3 and 4 corresponding.

Such a centering clearance between the two filling reliefs 12 of the or each pair of filling relief 12, where appropriate the or each single relief of filling, and the inner wall of the through hole 11 the (s) receiving has for aim of facilitating the centering of the or each through-hole 11 of the bolt 2, interposed between the first and second matrix 3 and 4, with the pair of filling reliefs 12, if necessary the only filling relief, corresponding (e) and to obtain an effective insertion of this last (e) in the corresponding through hole 11, without altering or deteriorate the latter. This centering clearance can be obtained by producing one or more through-holes 11 in the bung 2, preferably each of dimensions greater than those of a pair of filler reliefs 12, if necessary of a single filling relief, filling the through hole 11 corresponding.

Note that in the case where the present invention provides a centering game, the or each through hole 11 'or each bread 1 will be smaller than those of the or each through hole 11 of the bung 2 from which they respectively come molding.

The subject of the present invention is also a process for producing breads 1 pierced with one or more through-holes 11 'from shampoo bungs or other solid hygiene products such as soap, more particularly used by a unit. drilling and molding according to the present invention.

• dans une première étape à pratiquer transversalement dans un côté longitudinal 2' d'un bondon 2, en amont d'un ensemble de moulage 3 et 4 d'un ou de plusieurs pains 1 dans une ou plusieurs empreintes de moulage et de finition 5 et 6, un ou plusieurs perçages, ce en vue de réaliser dans ledit bondon 2 un ou plusieurs trous traversant 11, de préférence alignés dans l'axe dudit bondon 2, puis,
• dans une deuxième étape, à remplir lors du moulage, le ou chaque trou traversant 11 d'au moins un relief de remplissage 12 s'étendant dans la ou chaque empreinte de moulage et de finition 5 et 6 de sorte à maintenir la marque lors du moulage du ou de chaque trou traversant 11 pratiqué dans ledit bondon 2 ainsi percé, ce en en vue de réaliser des pains 1 percés d'au moins un trou traversant 11'.

Such a process consists of:

• in a first step to be practiced transversely in a longitudinal side 2 'of a bung 2, upstream of a molding assembly 3 and 4 of one or more loaves 1 in one or more molding and finishing impressions 5 and 6, one or more holes, in order to produce in said bung 2 one or more through holes 11, preferably aligned in the axis of said bung 2, then,
• in a second step, to be filled during the molding, the or each through hole 11 of at least one filling relief 12 extending in the or each molding and finishing imprint 5 and 6 so as to maintain the mark during the molding the or each through hole 11 formed in said bolt 2 and pierced, in order to achieve loaves 1 pierced with at least one through hole 11 '.

Of course, the invention is not limited to the embodiment described and shown in the accompanying drawings. Modifications are possible, particularly from the point of view of the constitution of the various elements or by substitution of technical equivalents, without departing from the scope of protection of the invention.

Claims (10)

1. Unit for piercing and moulding, by means of striking, pressing or stamping, for the production of bars (1) from plugs (2) of shampoo or other solid detergents or hygiene products such as soap leaving an extruder (1') and a cutter (1''), said unit comprising at least one moulding assembly (3) and (4) consisting of a first die (3) and a second die (4) which can move with respect to one another so that, in an open state of said moulding assembly (3) and (4), they are spaced apart from one another such that a plug (2) can be interposed between them and, in a closed state of said moulding assembly (3) and (4), they meet or approach one another so as to be in almost complete contact with one another while squeezing, with pressure, said plug (2) which fills at least one imprint (5) and (6) for moulding and finishing a bar (1), which imprint is formed by the cooperation between a first imprint (5) and a second imprint (6), which are complementary and are each respectively created in the first moulding die (3) and in the second moulding die (4), wherein said plugs (2) each comprise two opposite longitudinal sides (2') and (2'') and are brought into said unit by means of a transporting conveyer (13),
   the unit being characterized in that it further comprises:

   - upstream of the moulding assembly (3) and (4), a static or movable piercing station (14) able to create, in a plug (2), one or more through holes (11), preferably aligned with the axis of said plug (2), and

   - at least one filling relief (12) extending into the or each moulding and finishing imprint (5) and (6) and being able to fill, during moulding, the or one of the through holes (11) of said plug (2) pierced in this manner, so as to maintain the mark of its or each of its through holes (11) during moulding, with a view to producing one or more bars (1) pierced with one or more through holes (11').
2. Unit according to Claim 1, characterized in that the piercing station (14) comprises one or more piercing tools (7) which cooperate with an open-work supporting surface (10, 10') and are able to pierce one of the longitudinal sides (2') of a plug (2) which presses via its other opposite longitudinal side (2'') against said open-work supporting surface (10, 10') which is able to receive the or each piercing tool (7) passing substantially transversely through said plug (2) in order to pierce it.
3. Unit according to Claim 2, characterized in that the or each tool (7) for piercing the or each through hole (11) consists of a hollow punch or a mandrel.
4. Unit according to either of Claims 2 and 3, characterized in that the open-work supporting surface (10, 10') comprises either one or more openings (10') each able to receive the or one of the piercing tools (7) piercing at and in line with the corresponding opening (10'), or a single elongate opening (10') able to receive the piercing tool or tools (7) each piercing at and in line with an axis passing through said elongate opening (10').
5. Unit according to either of Claims 2 and 3, characterized in that the piercing station (14) is static and further comprises stopping means (8, 9) able to stop or hold a plug (2) in the piercing position in the piercing station (14), between the open-work supporting surface (10, 10'), facing the latter, and the piercing means (7).
6. Unit according to Claim 5, characterized in that the stopping means consist of an actuator (8), such as a jack, actuating a stop (9) which can be positioned and interposed in the path of the plug (2) passing through the piercing station (14), so as to stop or hold the latter facing and against the open-work supporting surface (10).
7. Unit according to any one of Claims 2 to 4, characterized in that the piercing station (14) is movable, that is to say that the assembly consisting of the or each piercing tool (7) and the open-work supporting surface (10, 10') can be made to move parallel to the axis of movement (D) of the plugs (2) when one of these is in the piercing position between the piercing tool or tools (7) and the open-work supporting surface (10, 10'), facing the latter, having been detected by detection means (15), for example photoelectric position sensors, with a view to creating one or more than one piercings in said plug (2) while accompanying, and at the same speed as, the latter.
8. Unit according to any one of Claims 1 to 7, characterized in that the or each imprint (5) and (6) for moulding and finishing a bar (1) comprises at least one pair of filling reliefs (12) composed of a first filling relief (12) attached to the base (5') of the first imprint (5) and a second filling relief (12) attached to the base (6') of the second imprint (6) such that, in the closed state of the moulding assembly (3) and (4), the first and second filling reliefs (12) of the or each pair of filling reliefs (12) extend into the corresponding moulding and finishing imprint (5) and (6) in the axial extension of and facing one another, being able to each be inserted into the or one of the through holes (11) while jointly filling the latter, possibly with a centring clearance, so as to maintain, during moulding, the mark of the through hole (11) in the or each bar (1) leaving the corresponding moulding assembly (3) and (4).
9. Unit according to any one of Claims 1 to 7, characterized in that at least one filling relief, attached to the base (5') of the first imprint (5) or to the base (6') of the second imprint (6), extends into the or each imprint (5) and (6) for moulding and finishing a bar (1) such that, in the closed state of the moulding assembly (3) and (4), the or each filling relief extends into the corresponding moulding and finishing imprint (5) and (6), being able to be inserted into the or one of the through holes (11) while filling the latter, possibly with a centring clearance, so as to maintain, during moulding, the mark of the through hole (11) in the or each bar (1) leaving the corresponding moulding assembly (3) and (4).
10. Method for producing bars (1) pierced by one or more through holes (11') from plugs (2) of shampoo or other solid hygiene products such as soap, more particularly implemented by means of a piercing and moulding unit according to any one of Claims 1 to 9, characterized in that it consists of:

    - in a first step, creating transversely in a longitudinal side (2') of a plug (2), upstream of an assembly (3) and (4) for moulding one or more bars (1) in one or more moulding and finishing imprints (5) and (6), one or more piercings, with a view to creating in said plug (2) one or more through holes (11) which are preferably aligned in the axis of said plug (2), then,

    - in a second step, filling, during moulding, the or each through hole (11) with at least one filling relief (12) which extends into the or each moulding and finishing imprint (5) and (6) so as to maintain the mark while moulding the or each through hole (11) created in said plug (2) pierced in this manner, with a view to creating bars (1) pierced by at least one through hole (11').

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