FR3125457A1 - Mold for a wrapper and dispenser assembly, corresponding manufacturing process and wrapper and dispenser assembly thus obtained - Google Patents

Abstract

Mold for a wrapper and dispenser assembly, corresponding manufacturing method and wrapper and dispenser assembly thus obtained. Mold (1) for injection of an assembly (2) comprising a cap (3) and a valve-type distributor (4), the mold comprising parts (6, 60, 61, 62, 63) for molding walls (30, 300, 301) of the cap (3), an area (7) for molding said distributor (4), and at least one injection point (9), the mold (1) comprising a member (8) forming of the distributor (4) having an active position for molding a web or sheets (40, 40', 40'') and an inactive position, delimiting a temporary space of thickness greater than twice that of the web or sheets , said injection point(s) (9) being able to fill this temporary space before the parts (6, 60, 61, 62, 63) are completely filled. Manufacturing process using said at least one mold to manufacture such an assembly (2). Set (2) thus manufactured. Container (5) comprising such an assembly (2). Figure for abstract: Fig.4

Description

Mold for a wrapper and dispenser assembly, corresponding manufacturing process and wrapper and dispenser assembly thus obtained

The present invention relates to a product dispenser device of all viscosities and a cap containing it. It may be a food product, pasty or not, of the mustard type or various sauces, but also cosmetic products in the form of creams, milks or liquids, or any other product.

The present invention also relates to a mold and a manufacturing method for manufacturing said device and said cap.

This type of dispensing device is arranged in a known manner on an elastically deformable container, at least partially, of which an upper open end receives a closure element commonly called in the field a cap. This cap has a distributor and this cap is open at its top via said distributor to allow the exit of the product during manual pressure on the container, upside down, and its re-aspiration when this pressure ceases. This cap is optionally covered by a removable cap connected or not to said cap by a hinge, capable of blocking the distributor to prevent the exit of the product by the distributor. The wrapper closed by the plug is said to be closed, and the wrapper not covered by the plug is said to be open.

A known problem in this type of dispensing device lies in the fact that the product drips when the container is turned over, cap open, on the one hand, and that during re-suction dry residues form around the pierced cap, hence a lack of hygiene, on the other hand. In addition, these residues can then block the outlet hole, making it difficult or impossible to dispense the product.

An attempt has been made to solve this problem by placing a central stud on the cap of the wrapper intended to penetrate into the exit hole of the product during the filling, but the stud only pushes the product inwards, to a depth equal to its height, and therefore does not prevent the formation of dry residues near the outlet. In addition, in the latter case, the product also drips when the container is upside down, cap open.

Also known to seek to solve this problem are dispenser devices comprising a cap equipped with a dispenser in the form of a central closing system, consisting of an added cleanliness valve.

This cleanliness valve is made in known manner from elastomer or silicone material, the cap comprising a housing for placing said valve, an attached ring holding said valve in said housing. If this system solves the problem of dripping and residue, it nevertheless has the following disadvantages:
- the number of component parts of the system is high because it requires an elastomer valve, a cap with a hinged cap (commonly called a service cap) or an attached cap, and a ring for holding the valve in the hole of said cap;
- Said valve being made of elastomer or silicone, the dispenser thus formed presents problems of recycling the assembly at the end of the life of the packaging.

In order to solve the aforementioned problems, it was also imagined to produce by injection of a plastic material an assembly comprising on the one hand a cap with a hinged or attached cap, and on the other hand a dispenser comprising a thin veil split into a sheet forming a valve, the whole of the dispenser and of the cap being made of a single material.

The manufacture of a cap with a hinged or attached cap involves thicknesses of material of the order of one to two millimeters, in order to ensure that the cap can be securely mounted on an opening of a container. partner, and that the cape can withstand a tearing force of several tens of Newtons.

At the same time, and in opposite manner, the manufacture by injection of a plastic material of a dispenser having the same effect as a cleanliness valve involves producing a thin web split into a sheet directly or subsequently by a cutting step, said veil having a very precise geometry, in particular as regards its thickness. In fact, this veil must have a thickness of the order of a tenth of a millimeter to allow elastic opening and closing of said valve, and to ensure operation in the manner of an elastomer or silicone valve.

It is known to produce the wrapper separately on the one hand, and the distributor on the other hand, then to assemble together, in particular by gluing, welding or clipping.

To simplify manufacturing and the cost price, it was imagined to make the cap and the dispenser in a single plastic injection operation. However, the production of such a part with such significant variations in thickness on a part that is on the whole small in size, of the order of two to four centimeters in diameter, comes up against well-known injection obstacles.

Indeed, a sudden excessive variation in thickness of the part can cause unsightly shrink marks to appear on the cap and/or possibly the cap of said cap connected to it by a hinge during the injection of a plastic material. in a cavity of an injection mold configured to produce such a cap with dispenser.

In addition, to properly fill the injection mold, the plastic material needs to have a higher melt index than the melt index usually used to make a stopper or service cap, which requires modifying and adjusting precisely the usual injection parameters for making a wrapper without a dispenser.

The term fluidity index, or melt flow index, denotes a fluidity value of the plastic material measured by a method commonly used in the plastics industry for the characterization of thermoplastic materials, in particular according to the ASTM D1238 standards, ASTM D3364, ISO 1133-1, ISO 1133-2, BS 2782, DIN 53735 or JIS K7210.

An insufficient melt index can form material gaps at the level of the filling of the mould, at the level of the distributor and more precisely of the thin web. And if one seeks to compensate for the fluidity by a significant increase in pressure and injection speed, burrs may appear at the level of the vents of said mold intended to let air out of the mold when filling the mold with the material. melting plastic. In addition, this can lead to a degradation of the plastic material, burnt at the level of the thin veil because of its heating by friction against the walls of the mold, due to the filling in force and quickly of a thin thickness of the thin veil.

It is also necessary to use an injection molding machine with a higher tonnage than to make a cap with or without a hinged cap without a veil-type distributor, in order to provide greater injection pressure.

In fact, the geometry of a thin veil forming a valve is in fact so precise that it is not compatible with the injection conditions of a massive part.

The injection process of such a cap and distributor assembly therefore requires complex and costly development, and in the case of a slight change in the fluidity of the material, the settings must be modified, otherwise the parts produced are non-compliant.

All this has a significant cost in terms of investment and the cost of making each set.

Another known solution is to use a mold allowing the successive injection of several plastic materials during the same injection phase in a mold, by bi-injection or injection by rotary mold. The wrapper is then produced in two successive steps, with the formation of the thick body of the wrapper with a first material, and the formation of the thin veil in a second step with another material, in particular more fluid.

But this solution complicates the mold and the necessary injection machine and increases their price. In addition, it increases the manufacturing time. The cost price of the wrapper thus obtained is also increased here.

It is therefore an object of the invention to propose a method of manufacturing by injection of a plastic material an assembly capable of covering an orifice of a neck of a container, comprising a cap with a cap to hinged or attached, the assembly also comprising a single-material valve-type distributor, that is to say injected at the same time as at least part of the wrapper, said method not presenting the problems of the prior art.

In fact, this method according to the invention is simple, rapid and economical; it allows a manufacturing time for an assembly close to that of a standard wrapper without a valve-type distributor.

This process allows simple adjustment little influenced by variations in the fluidity of the injected plastic material.

Another object of the invention is to provide an injection mold allowing the implementation of this method, said mold being simple and economical to manufacture.

Another object of the invention is to provide such an assembly comprising a cap with or without a hinged cap, said assembly also comprising a distributor of the cleanliness valve type, said assembly being produced in a single injection phase, preferably single-material, said distributor allowing the distribution of products of all viscosities, in particular liquid or pasty food products or cosmetic products.

Yet another object of the invention is to provide a container comprising such an assembly, this assembly covering an orifice of a neck of said container.

To this end, the invention relates to an injection mold of at least one plastic material of an assembly capable of covering an orifice of a neck of a container, said assembly comprising a cap and a valve-type distributor , said mold comprising:
- parts capable of forming a volume to mold the walls of the cap by injection of a plastic material,
- a zone capable of forming a volume for molding said valve-type distributor by injection of a plastic material,
- at least one point of injection of a plastic material,
characterized in that the mold comprises in said zone a member for forming by injection of the dispenser which can have a so-called active position, capable of forming a volume for molding a veil or leaflets of the valve-type dispenser, and a so-called inactive, retracted position, then delimiting a temporary space with a thickness greater than at least twice the thickness of said veil or of said sheets, and in that said at least one injection point is suitable for filling said temporary space at least partially with said plastic material before the complete filling of said plastic material of the volume to mold the walls of the cape.

According to an additional characteristic of the invention, the thickness of the temporary space is close to the thickness of the walls of said cape, to within 25% at most.

According to an additional characteristic of the invention, the mold comprises means for detecting the degree of filling of said temporary space with plastic material when the forming member of the dispenser is in the inactive position.

According to another additional characteristic of the invention, the mold is a mold having a first position, suitable for forming the cap and the dispenser of at least one assembly by injection of said plastic material, and at least a second position, suitable for forming additional parts to said wrapper by injecting at least one other plastic material. This mold is in particular a sluice, rotary or pivoting mold.

According to another additional feature of the invention, the mold forming member comprises several concentric subassemblies, movable independently of each other.

This makes it possible to move a central sub-assembly then one or more peripheral sub-assemblies from an inactive position to an active position. This makes it possible to facilitate the evacuation of overflow of plastic material gradually from the center of the forming member towards the periphery to the volume delimited by the parts of the mold capable of forming the walls of the wrapper. The stresses on the plastic material are thus limited. This also makes it possible to be able to adjust the thicknesses of the veil or of the sheets precisely at the level of each sub-assembly. Modifications of the mold at the level of the geometry of the distributor are thereby simplified since only one or several sub-assemblies can be changed independently.

The invention relates to a process for manufacturing by injection of at least one plastic material an assembly capable of covering an orifice of a neck of a container, said assembly comprising a cap and a valve-type distributor, said process using a block of at least one mold as described above, said block being mounted on a machine for injecting at least one plastic material, said method comprising the following steps for each mold:
- the mold is closed and the injection forming member of the distributor of said mold is placed in its inactive position,
– a plastic material is injected into said mold to fill the temporary space delimited by the forming member with a quantity of plastic material corresponding to the quantity of plastic material sufficient to form a veil or leaflets of the valve-type dispenser and form an overflow, and this before the complete filling of the volume delimited by the parts of said mold with said plastic material,
– the forming member of said mold is set in motion from its inactive position to its active position, and a veil or leaflets of the valve-type distributor are thus formed while expelling the overflow of plastic material into the volume delimited by the parts of said mould,
– we finish filling by injection the volume delimited by the said parts to form the walls of the cape,
– once the wrapper has cooled sufficiently, the mold is opened,
– if said mold has formed a veil of the distributor, the veil is cut by cutting means to form sheets.

This process makes it possible to ensure that there is no lack of material and avoids exerting strong pressure on the plastic material during the forming of the valve-type distributor.

The overflow of material is expelled into the volume delimited by the parts of the mold used to form the walls of the cape. Thus, even in the event of variation in fluidity, it is simply ensured that the mold is properly filled, even at the level of the web or of the leaflets of the distributor, whatever the fineness of the leaflets or of the web.

One can obtain a complete assembly, or an assembly requiring an additional operation of section of the veil. This particular solution ensures that the valve-type distributor has an elastic return effect of the cut sheets to a rest position suitable for the sheets to abut on their cut sides.

According to another characteristic of the method according to the invention, if the mold comprises means for detecting the degree of filling of said temporary space with plastic material when the forming member of the dispenser is in the inactive position, the method comprises, for at least one mold during the step of injecting a plastic material to fill the temporary space delimited by the forming member:
- an operation for detecting that said temporary space contains the quantity of plastic material sufficient to form a veil or leaflets of the valve-type dispenser and to form an overflow, this detection being done by the means for detecting the degree of filling of said mould,
- An operation, once the sufficient quantity has been detected, of implementing the next step of the method by controlling the setting in motion of the member for forming the at least one mold from its inactive position to its active position.

This makes it possible to secure the process by activating the step of movement of the forming member when there is enough plastic material to form the veil or the sheets.

According to another characteristic of the method according to the invention, before or after the step of the method of cutting the web by cutting means to form sheets if the mold has formed a web of the dispenser, if the mold is a mold having a first position, suitable for forming the cap and the dispenser of at least one assembly by injecting said plastic material, and at least a second position, suitable for forming additional parts to said cap by injecting at least one other plastic material , the method comprises a step of moving the at least one mold from the first position to the second position, then optionally to other positions, to form by injection of at least one other plastic material additional parts to said wrapper.

This makes it possible to offer a set with a cape with different colors or different shapes.

According to another characteristic of the method according to the invention, if the member for forming the mold comprises concentric subassemblies that are movable in distinct ways, during the step of setting the forming member in motion from its inactive position to its active position, a central sub-assembly is set in motion first, then one or more peripheral sub-elements from an inactive position to an active position.

According to another characteristic of the invention of the process according to the invention, several molds are mounted on the block installed on the injection machine and the steps of the manufacturing process by injection are applied at the same time and/or alternately to the molds. described above.

This makes it possible to accelerate the number of parts to be produced and reduce the manufacturing time of the parts.

The invention also relates to an assembly suitable for covering an orifice of a neck of a container, said assembly comprising a cap and a valve-type distributor, said assembly being obtained by implementing the method described above. This method is implemented using the at least one mold having the corresponding characteristics as described above.

The invention finally relates to a container comprising such an assembly, this assembly covering an orifice of a neck of said container.

Such a container is then economical to manufacture, the cost of a wrapper usually constituting a significant portion of the cost of a resealable container.

It should be noted that not only does the invention solve the problems enumerated previously, but it allows it in an extremely simple and extremely economical way compared to what was known from the prior art.

In addition, an assembly can be obtained in a single plastic material, or in several mutually compatible plastic materials, which makes it possible to simplify recycling, unlike capes comprising silicone cleanliness valves.

Other aims and advantages of the present invention will appear during the description which will follow, referring to the attached drawings illustrating an example embodiment and in which:

is a schematic front perspective view of an assembly comprising a cap and a valve-type dispenser according to the invention, this assembly being capable of covering a neck of a bottle, not shown here;

is a side sectional schematic side view of a container having an assembly of the comprising a cap and a valve-type dispenser, this assembly covering a neck of the container to cover an orifice of said neck;

is a detail view according to the dotted frame III of the of the assembly, centered on the valve-type distributor;

is a schematic sectional view of a mold capable of forming the whole of the , this mold having a member for forming the valve-type distributor in the inactive position, that is to say comprising a central sub-assembly and a peripheral sub-assembly, with the two central and peripheral sub-assemblies of the member both in inactive position, and showing in black the free volume delimited by the mould;

is a schematic sectional view of the mold of the from the same angle of view, the valve-type distributor forming member being in an intermediate position between the active and inactive position, with the central sub-assembly of the valve-type distributor forming member in the active position and the peripheral sub-assembly of the forming member of the valve-type distributor in the inactive position, and making the free volume delimited by the mold appear in black;

is a schematic sectional view of the mold of the from the same angle of view, the forming member of the valve-type distributor being in an active position, that is to say with the two central and peripheral sub-assemblies of the member both in the active position and making appear in black the free volume delimited by the mold corresponding to the assembly to be molded, wrapper and distributor.

The invention relates to a mold 1 illustrated schematically in FIGS. 4 to 6, allowing the manufacture of an assembly 2 according to the invention, comprising a cap 3 and a valve-type distributor 4. This assembly 2, illustrated in particular by there , is obtained by injecting at least one plastic material into said mold 1 by implementing a method according to the invention described below. This assembly 2 can cover an orifice of a container 5 at the level of a neck 50, as illustrated in the .

With reference to the , set 2 has a front and a rear located respectively to the right and to the left of the , and a top and a bottom located respectively at the top and bottom of the .

Similarly, with reference to Figures 4 to 6, the mold 1 has a front and a rear located respectively to the right and left of the figures, and a top and a bottom located respectively at the top and bottom of the figures.

The assembly 2 comprises a cap 3 having walls 30, in particular peripheral 300 and upper 301. This cap 3 can also comprise a cap 31 connected to the peripheral wall 300 by a hinge 32, as illustrated in FIGS. 1 and 2. This cap 3 also comprises means 33 for mounting said cap 3 on a neck of a container, as illustrated in the . These mounting means 33 are here a thread internal to the peripheral wall 300 of the cap 3, cooperating with an external thread of the neck 50 of the container 5, as illustrated in the . The cap 3 also includes a sealing lip 302 under the upper wall 301 of the cap 3, which comes into contact with the neck 50 of the container 5 when the assembly 2 is mounted thereon.

A distributor 4 is in the center of the wrapper 3 and is integral with the wrapper 3. This distributor 4 has a lower face and an upper face, it is circular and has triangular sheets 40, each sheet 40 being abutted on one edge 41 to one edge of a sheet 40' and another edge 42 to another sheet 40'', the third edge of the sheets being integral with an annular belt 43. This distributor 4 has the shape of an elastically deformable disc which can be 'open in its center by separating the edges 41, 42 of the sheets 40, 40', 40'' under the effect of pressure of a liquid or pasty product against said sheets 40, 40', 40'', and being able to return to an initial position of the sheets with abutting edges, closing said opening in the absence of pressure exerted on the sheets. The annular belt 43 can be rigid or comprise an elastically deformable ring 44, which can, by its deformation, lift the disk of the leaflets 40 from a low position illustrated on the in a high position, so that the dispenser 4 operates like a silicone valve.

The sheets 40, 40', 40'' can be three, four or more in number. Here they are four in number, as illustrated in the . The dispenser 4 can be molded with sheets 40 or with a web not shown here, instead of the sheets 40. This web is then cut into sectors by cutting means such as cutting blades to form the sheets 40 Alternatively, this web can be cut into sectors by other cutting means to form the sheets 40, such as laser beams, sonotrodes subjected to ultrasonic vibrations, or any other means allowing such a cut.

The material of assembly 2 can be a polyolefin, in particular a polypropylene or a high density polyethylene.

This assembly 2 made in one piece from a single plastic material can be supplemented by additional parts to said cape 3. This can be for example a colored border on the periphery of the peripheral wall 300 of the cape 3, or a covering part of the plug 31. These additional parts can be made of the same plastic material as that of assembly 2, or in another plastic material compatible with the plastic material of assembly 2.

Thus, if the assembly 2 is made of polyolefin, in particular polypropylene or high-density polyethylene, the additional parts may be made of elastomeric modified polyolefin.

Such a set 2 allows a liquid or pasty product to be dispensed in a single piece, which is economical and facilitates its recycling.

The container can also be made of polyolefin, in particular high-density polyethylene or polypropylene comprising such a set 2.

To manufacture such an assembly 2, a mold 1 is used mounted on an injection machine of at least one plastic material. This mold 1 can be part of a block that can be mounted on an injection machine. This block can come from material with the mold 1, as illustrated here.

It should however be noted that the block may comprise several molds 1, as described below.

The mold 1 has an upper cavity 10 and a lower cavity 11, delimiting a hollow space intended to be filled at least partially with a plastic material to form the assembly 2.

The mold 1 comprises parts 6 suitable for delimiting a volume for molding the wrapper 3. These parts 6 comprise an upper part 60 of the upper cavity 10 delimiting the upper wall 301 of the wrapper 3 and the inner surfaces of the stopper 31 and of the hinge 32. These parts 6 also comprise lower parts 61, 62, 63 of the lower recess 11, that is to say a lower peripheral part 63 delimiting the outside of the cap 3 and the plug 31 of the wall, an unscrewable lower part 62 delimiting the internal thread and the peripheral wall 300 of the cap 3 and one face of the sealing lip 302, and a central lower part 61 delimiting the other face of the sealing lip 302.

The mold 1 also comprises a zone 7 suitable for forming the valve-type distributor 4, with an upper zone 70 of the upper cavity 10, and a lower zone 71 of the lower cavity 11.

The upper zone 70 comprises a piece of mold 700 which delimits the upper face of the distributor 4.

The lower zone 71 comprises a member 8 for forming the distributor 4, which delimits the lower face of the distributor 4.

This member 8 can present a so-called active position illustrated by the , suitable for forming a veil or sheets 40, 40', 40'' of the valve-type distributor 4, member 8 at the top.

This member 8 can have a so-called inactive position, member 8 down, illustrated by the , the member 8 then delimits a temporary space with a thickness close to the thickness of the walls of the cap 3, in particular the peripheral wall 300, to within 25%. This thickness is greater than the thickness of the veil or of the sheets 40, 40', 40'' of the distributor 4. In fact, this thickness can be at least twice greater than that of the veil or of the sheets of the distributor 4, which corresponds to a minimum thickness making it possible to limit injection problems. This thickness may optionally be at most five times greater than that of the veil or of the leaflets of the dispenser 4, which corresponds to a maximum thickness that is simple to implement.

A thickness of the temporary space equal to the thickness of the walls of the cap 3, in particular the peripheral wall 300, facilitates the injection of the plastic material and simplifies the manufacture of the mold 1.

Thus, for example, for walls having a thickness of 1.2 millimeters and a veil or sheets having a thickness of between 0.15 and 0.4 millimeters, the temporary space has a thickness of between 0.9 and 2 millimeters, in particular 1.2 millimeters.

For example again, for walls having a thickness of 1 millimeter and a veil or sheets having a thickness of between 0.15 and 0.35 millimeters, the temporary space has a thickness of between 0.75 and 1.75 millimeters , in particular 1 millimeter.

For example again, for walls having a thickness of 0.8 millimeters and a veil or sheets having a thickness of between 0.15 and 0.3 millimeters, the temporary space has a thickness of between 0.6 and 1, 5 millimeters, in particular 0.8 millimeters.

This member 8 here comprises two concentric sub-assemblies 80, 81, that is to say a central sub-assembly 80 and a peripheral sub-assembly 81 surrounding the central sub-assembly 80, juxtaposed with the lower central part 61. These subsets 80, 81 are movable independently of each other.

The central sub-assembly 80 delimits the underside of the veil or of the sheets.

The peripheral sub-assembly 81 delimits the lower faces of the annular belt 43 and of the elastically deformable ring 44.

Of course, this peripheral sub-assembly 81 can be split into several concentric sub-sub-assemblies, nested and encircled one inside the other, mobile independently of one another.

The member 8 can then have an intermediate position between active and inactive position, with the central sub-assembly 80 of the member 8 in the active position, at the top, and the peripheral sub-assembly 81 of the member 8 in the inactive position , retracted, down, as shown by the .

The mold 1 also comprises at least one injection point 9, here two injection points, at the end of injection nozzles 90. An injection nozzle 90 passes through the upper part 60 of the mold 1 and emerges through a injection point 9 at the level of the volume suitable for molding the stopper 31. Another injection nozzle 91 passes through the piece of mold 700 of the upper zone 70 to emerge in the space suitable for molding the distributor 4. This other nozzle injection molding 91 makes it possible to fill the temporary space at least partially before the complete filling with the plastic material of the molding volume of the walls of the cap 3 delimited by the parts 6.

The mold 1 may also include means for detecting the degree of filling of said temporary space with plastic material when the member 8 for forming the distributor 4 is in the inactive position, in the form for example of pressure sensors at the surface of the mold piece 700.

To produce an assembly 2 completed by additional parts, the mold 1 may comprise a third cavity in the block, close to the upper 10 or lower 11 cavity, making it possible to move the lower 11 or upper 10 cavity respectively with the assembly 2 molded so as to mold the additional parts on the assembly 2 by causing this cavity to cooperate with the third cavity. Mold 1 can also include other additional cavities to mold other additional parts.

The mold 1 can also be a so-called sluice mould, that is to say that a portion of one and/or the other of the upper 10 or lower 11 cavities moving to release an additional volume allowing the injection and molding of additional parts.

In fact, the mold 1 can be a sluice, rotary or swivel mold.

In fact, the mold 1 is then a mold 1 having a first position, capable of forming the cap 3 and the distributor 4 of at least one assembly 2 by injection of said plastic material, and at least a second position, capable of forming additional parts to said cape 3 by injection of at least one other plastic material, this other plastic material being identical or chemically compatible with the plastic material used to make the assembly 2.

Set 2 once molded and unmolded can also be placed in another mold to overmold the additional parts on set 2.

The block mounted on the injection machine may comprise several molds 1 on the same side of the block and/or on different or opposite sides of said block.

The assembly 2 is molded by injection of at least one plastic material into the mold 1 by implementing the method described below.

This method uses a block comprising at least one mold 1 as described above, mounted on a machine for injecting at least one plastic material.

During this process, the following steps are carried out:
- the mold 1 is closed and the member 8 for forming by injection of the distributor of said mold 1 is placed in its inactive position,
- a plastic material is injected into said mold 1 to fill the temporary space delimited by the member 8 for forming a volume and by the piece of mold 700 of the upper zone 70 of plastic material corresponding to the quantity of plastic material sufficient to form a veil or sheets 40 of the valve-type distributor 4 and form an overflow, and this before the complete filling with said plastic material of the volume delimited by the parts 6 of said mold 1,
– the member 8 for forming said mold 1 is set in motion from its inactive position to its active position, and a veil or leaflets 40 of the valve-type distributor 4 are thus formed, while expelling the overflow of plastic material in the volume delimited by the parts 6 of said mold 1,
– we finish filling by injection the volume delimited by said parts 6 to form the walls 30 of the cape 3,
– once the wrapper 3 has cooled sufficiently, said mold 1 is opened,
– if said mold 1 has formed a veil of the distributor 4, the veil is cut by cutting means to form sheets 40.

Optionally, if the mold 1 comprises means for detecting the degree of filling of said temporary space with plastic material when the member 8 for forming the dispenser is in the inactive position, the method comprises, for at least one mold 1, during the step injection of a plastic material to fill the temporary space delimited in particular by the forming member 8 and additionally by the piece of mold 700 of the upper zone 70:
- an operation of detecting that said temporary space contains the quantity of plastic material sufficient to form a veil or leaflets 40 of the valve-type distributor 4 and to form an overflow, this detection being done by the means for detecting the degree of filling of said mold 1,
- an operation, once the sufficient quantity has been detected, of implementing the next step of the method by controlling the movement of the member 8 for forming the at least one mold 1 from its inactive position to its active position . This setting in motion can be done by controlling the actuation of a hydraulic cylinder.

Optionally, if the mold has formed a web of the dispenser, before or after the process step of cutting the web by cutting means to form sheets 40, if the mold is a mold having a first position, suitable for forming the cap 3 and the distributor 4 of at least one assembly 2 by injection of said plastic material, and at least a second position, capable of forming additional parts to said cap 3 by injection of at least one other plastic material, the method comprises a step of moving the at least one mold 1 from the first position to the second position, then optionally to other positions, to form by injection of at least one other plastic material additional parts to said cap 3.

Optionally, if the member 8 for forming the mold 1 comprises concentric subassemblies 80, 81, movable in distinct ways, during the step of setting the member 8 in motion from its inactive position to its position active, a central sub-assembly 80 is set in motion first, then one or more peripheral sub-assemblies 81 from an inactive position to an active position. This setting in motion of the sub-assemblies 80, 81 can be done by controlling the actuation of a hydraulic jack specific to each one.

Optionally, if the block mounted on the injection machine may comprise several molds 1 on the same side of the block and/or on different or opposite sides of said block, several molds are mounted on the block installed on the injection machine and the steps of the manufacturing process by injection of assemblies 2 described above are applied simultaneously and/or alternately to the molds.

Claims (11)

Mold (1) for injection of at least one plastic material from an assembly (2) capable of covering an orifice of a neck (50) of a container (5), said assembly (2) comprising a cap (3) and a valve-type distributor (4), said mold (1) comprising:
- parts (6, 60, 61, 62, 63) capable of forming a volume for molding the walls (30, 300, 301) of the cover (3) by injection of a plastic material,
- a zone (7) capable of forming a volume for injection molding said valve-type distributor (4) by injection of a plastic material,
- at least one injection point (9) of a plastic material,
characterized in that the mold (1) comprises in said zone (7) a member (8) for forming by injection of the distributor (4) which can have a so-called active position capable of forming a volume for molding a veil or sheets (40, 40', 40'') of the valve-type dispenser (4), and a so-called inactive, retracted position, then delimiting a temporary space of thickness greater than at least twice the thickness of said web or of said sheets (40, 40' ,40''), and in that said at least one injection point (9) is capable of filling said temporary space at least partially with said plastic material before the complete filling of said plastic material of the volume for molding the walls ( 30, 300, 301) of the cover (3). Injection mold (1) according to claim 1, characterized in that it comprises means for detecting the degree of filling of said temporary space with plastic material when the member (8) for forming the dispenser is in the inactive position. Injection mold (1) according to Claim 1 or Claim 2, characterized in that it is a mold (1) having a first position, suitable for forming the cap (3) and the distributor (4) of at least one assembly (2) by injection of said plastic material, and at least one second position, capable of forming additional parts to said cap (3) by injection of at least one other plastic material. Injection mold (1) according to Claim 1 or Claim 2, characterized in that the member (8) for forming the mold (1) comprises several concentric sub-assemblies (80, 81), movable independently of one another. others. Method of manufacturing by injection of at least one plastic material an assembly (2) capable of covering an orifice of a neck (50) of a container (5), said assembly (2) comprising a cap (3 ) and a valve-type distributor (4), said method using a block of at least one mold (1) according to one of claims 2 to 4, said block being mounted on an injection machine of at least one plastic material, said method comprising the following steps for each mold (1):
- the mold (1) is closed and the member (8) for forming by injection of the distributor (4) of said mold (1) is placed in its inactive position,
– a plastic material is injected into said mold (1) to fill the temporary space delimited by the forming member (8) with a quantity of plastic material corresponding to the quantity of plastic material sufficient to form a veil or sheets (40, 40', 40'') of the valve-type distributor (4) and form an overflow, and this before the complete filling of the parts (6, 60, 61, 62, 63) of said mold (1) with said plastic material,
– the member (8) for forming said mold (1) is set in motion from its inactive position to its active position, and a veil or sheets (40, 40', 40'') of the type distributor are thus formed valve (4), while expelling the overflow of plastic material into the volume delimited by the parts (6, 60, 61, 62, 63) of said mold (1),
– we finish filling said parts (6, 60, 61, 62, 63) by injection to form the walls (30, 300, 301) of the cape (3),
– once the wrapper (3) has cooled sufficiently, said mold (1) is opened,
– if said mold (1) has formed a veil of the distributor (4), the veil is cut by cutting means to form sheets (40, 40', 40''). Injection manufacturing process according to claim 5, the at least one mold (1) used having the additional characteristics of claim 2, said process being characterized in that it comprises for at least one mold (1) during the step of injecting a plastic material to fill the temporary space delimited by the forming member (8):
- an operation of detecting that said temporary space contains the quantity of plastic material sufficient to form a veil or sheets (40, 40', 40'') of the valve-type distributor (4) and to form an overflow, this detection by means of detecting the degree of filling of said mold (1),
- an operation, once the sufficient quantity has been detected, of implementing the next step of the method by controlling the movement of the member (8) for forming the at least one mold (1) from its inactive position to its active position. Injection manufacturing process according to claim 5 or claim 6, the at least one mold (1) used having the additional characteristics of claim 3, said process being characterized in that it includes a step of passing the at least one at least one mold (1) from the first position to the second position, then optionally to other positions, to form by injection of at least one other plastic material additional parts to said cap (3), this step being carried out work before or after the stage of the method of cutting the web by cutting means to form sheets (40, 40', 40'') if the at least one mold (1) has formed a web of the dispenser (4) . Manufacturing process by injection according to one of Claims 5 to 7, the at least one mold (1) used having the additional characteristics of Claim 4, the said process being characterized in that during the step of setting in motion of the forming member (8) from its inactive position to its active position, a central sub-assembly (80) is set in motion first, then one or more peripheral sub-assemblies (81) from an inactive position to an active position. Injection manufacturing process according to one of Claims 5 to 8, characterized in that several molds (1) are mounted on the block installed on the injection machine and that at the same time and/or or alternately to the molds (1) the steps of the manufacturing process by injection of one of claims 5 to 8. Assembly capable of covering an orifice of a neck (50) of a container (5), said assembly (2) comprising a cap (3) and a valve-type distributor (4), said assembly (2) being obtained by implementing the method according to one of Claims 5 to 9. Container (5) comprising an assembly (2) according to claim 10, this assembly (2) covering an orifice of a neck (50) of said container (5).