WO2019042826A1

WO2019042826A1 - Dual-material injection mould for a dual-material lid intended to close a bottle, method for manufacturing a dual-material lid implementing such a mould and dual-material lid obtained by implementing such a method

Info

Publication number: WO2019042826A1
Application number: PCT/EP2018/072554
Authority: WO
Inventors: Victor Ramos; Nicolas LEMARIE
Original assignee: Albea Services
Priority date: 2017-08-28
Filing date: 2018-08-21
Publication date: 2019-03-07
Also published as: FR3070298B1; FR3070298A1

Abstract

The invention concerns a dual-material injection mould (10) for a dual-material lid comprising an injection member (11, 12) comprising an injection pipe (17, 23) and a first moulding part (13) designed to be attached around the injection member and comprising an inner surface (26) defining a first hollow imprint, the shape of which matches an outer surface of a main body of the dual-material lid to be moulded, the injection member (12) being at least partially designed to move in translation, relative to the main body of the dual-material lid formed by injecting a first material, between a first injection position in which the first material is injected and a second injection position in which a second material is injected, a distal end (20) of the injection member being arranged at a distance from a bottom wall of the main body of the dual-material lid, when the injection member (12) is in the second injection position, so as to free up an additional injection space (22) into which the injection pipe opens.

Description

Bi-material injection mold for a bi-material hood intended to close a bottle, a process for manufacturing a bi-material hood using such a mold and bi-material hood obtained by the implementation of such a method

The invention relates to a bi-material injection mold for a bi-material hood intended to close a bottle, in particular a bottle containing a cosmetic product. The invention also relates to a method of manufacturing a bi-material hood implementing such a mold and a bi-material hood obtained by the implementation of such a method.

Conventionally, a bi-material hood is made from two injection molds, a first injection mold being placed at a first injection station and a second injection mold being placed at a second injection station.

Thus, a first portion of the bi-material cover is first made at the first injection station by injection of a first material into the first injection mold, around a cylindrical core, then the first portion of the bi-material cover. material is moved on the cylindrical core to the second injection station in the second injection mold where a second material, different from the first material, is injected around the first portion so as to produce a second portion of the bi-material cover .

However, this requires that the injection of the second material is carried out from a point, called the injection point, located outside the second portion of the bi-material cover. Since this injection point is often visible to the naked eye, it can give the users of said bi-material cover the impression that the bi-material cover lacks a finish and therefore gives them a negative image of the product, for example the cosmetic product, contained in the bottle closed by said bi-material hood.

The object of the present invention is to propose a bi-material injection mold making it possible to obtain a bi-material hood without injection point visible from the outside of said bi-material hood. Thus, the invention relates to a bi-material injection mold for a bi-material hood intended to close a bottle, in particular a bottle containing a cosmetic product, the bi-material hood comprising:

a main body made from a first material and comprising a side wall extending around a longitudinal extension direction (X) and a bottom wall covering one end of the side wall in the direction longitudinal extension, and

a secondary body made from a second material different from the first material,

the injection mold having a first configuration in which the first material is injected into the injection mold and a second configuration in which the second material is injected into the injection mold,

the injection mold comprising:

a generally cylindrical injection member, extending in the direction of longitudinal extension between a distal end and a proximal end and comprising an injection duct extending between an inlet orifice arranged at the end proximal of the injection member and an outlet orifice arranged in the direction of longitudinal extension or parallel to the direction of longitudinal extension at the distal end of the injection member,

a first bell-shaped molding piece adapted to be fitted around the injection member in the first configuration of the injection mold, the first molding piece extending around the direction of longitudinal extension, when said first molding piece is attached around the injection member, the first molding piece comprising an inner surface defining a first hollow recess of complementary shape with an outer surface of the main body of the bi-material cover to be molded, so as to forming said outer surface of the main body of the bi-material hood, when the first material is injected into the injection mold,

the injection member being at least partly designed to move in translation in the direction of longitudinal extension relative to the main body of the bi-material cover formed in the first configuration of the injection mold, between a first position of injection in which the mold to injection is in the first configuration and a second injection position in which the injection mold is in the second configuration, the distal end of the part of the injection member moving in translation or the body of injection being arranged at a distance from the bottom wall of the main body of the bi-material hood formed in the first configuration of the injection mold, when the injection member is in the second injection position, so as to release a space additional injection on which opens the injection conduit of the injection member via the outlet orifice.

According to different embodiments, which can be taken together or separately:

the injection member comprises:

a generally cylindrical fixed injection core extending in the direction of longitudinal extension between a distal end and a proximal end and comprising an injection conduit extending between an inlet orifice arranged at the level of the proximal end of the injection core and an outlet port arranged at the distal end of the injection core on a side surface of said injection core,

a generally tubular crown extending around the direction of longitudinal extension and having a distal end and a proximal end in the direction of longitudinal extension, the ring being designed to slide along the injection core in the direction of longitudinal extension between a first injection position in which the injection mold is in the first configuration and a second injection position in which the injection mold is in the second configuration, the distal end of the crown being closer of the proximal end of the injection core in the second injection position than in the first injection position, so that the distal end of the crown releases additional injection space, when said ring is in the second injection position, the ring further comprising an injection conduit extending between an inlet port in fluid communication with the injection port of the injection core, when the ring is in the first and second injection positions, and an outlet port arranged parallel to the direction of injection. longitudinal extension at the distal end of the crown;

the secondary body of the bi-material hood comprises at least one outer portion arranged against an outer surface of the main body of said bi-material hood;

the first molding member further comprising at least one protrusion extending from the inner surface of the first molding member to the additional injection space occupied by the distal end of the injection member or the ring, when the injection mold is in the first configuration, so as to achieve in the main body of the bi-material hood at least one channel connecting the additional injection space to a zone, called the receiving zone, formed in the outer surface of the main body and intended to receive the one or one of the outer portions of the secondary body, the second material joining the receiving zone or zones to form the outer portion or portions of the secondary body, via the additional injection space and channel (s) formed in the main body of the bi-material hood, when the injection mold is in the second configuration;

the outer portion or portions of the secondary body of the bi-material cover are arranged at least partly against an outer lateral surface of the main body of said bi-material cover;

the projection or each of the projections of the first molding piece extends in a direction of transverse extension perpendicular to the direction of longitudinal extension, the directions of transverse extension of each of the projections being parallel or merged with each other;

the injection mold further comprises a second bell-shaped molding piece adapted to be attached, in the second configuration of the injection mold, around the injection member and the main body of the bi-material hood formed in the first configuration of the injection mold, the second molding piece extending around the longitudinal extension direction, when said second molding piece is brought around of the injection member, the second molding piece comprising an inner surface defining a second hollow recess of complementary shape with an outer surface of the bi-material cover to be molded, the second recess being designed to define with the outer surface of the body main bi-material hood formed in the first configuration of the injection mold at least one complementary shaped recess with the or one of the outer portions of the secondary body bi-material cover to be molded;

the distal end of the ring protrudes from the distal end of the injection core in the direction of longitudinal extension, when the ring is in the first injection position, so as to form a groove in a surface inside the bottom wall of the main body of the bi-material hood, when the injection mold is in the first configuration;

the distal end of the ring and the distal end of the injection core are arranged in the same plane orthogonal to the direction of longitudinal extension, when the ring is in the second injection position, the groove formed in the wall bottom of the main body of the bi-material hood in the first configuration of the mold and the distal end of the crown together defining the additional injection space, when the injection mold is in the second configuration;

the injection mold further comprises a fixed core, generally tubular, mounted around the injection member or the crown and extending around the direction of longitudinal extension, the core comprising an outer surface of complementary shape with an inner side surface of the main body of the bi-material hood to be molded;

the outer side surface of the core comprises an undercut extending circumferentially around the longitudinal extension direction;

the first molding part comprises a pair of semi-bell-shaped drawers, the drawers being designed to move in translation relative to each other in a transverse direction, perpendicular to the direction of longitudinal extension, when the injection mold is in the first configuration, between a close position in which the drawers continuously form the inner surface defining the first impression and a spaced apart position in which the drawers are arranged at a distance from one another;

the second molding piece comprises for example a pair of half-bell-shaped drawers, the drawers being designed to move in translation relative to one another in the transverse direction, when the injection mold is in the second configuration, between a close position in which the drawers continuously form the inner surface defining the second footprint and a spaced apart position in which the drawers are arranged at a distance from each other;

the direction or directions of transverse extension are parallel or merged with the transverse direction.

The invention also relates to a method of manufacturing a bi-material hood using a bi-material injection mold as previously described, the method comprising the following steps of:

- Implementation of the injection mold in the first configuration, the first molding part being positioned around the injection member and the injection member being in the first injection position;

injecting the first material into the injection mold, the first material being injected into the first hollow cavity of the first molding part via the injection ducts of the injection member, so as to form the main body of the hood; Bi-material ;

- Implementation of the injection mold in the second configuration, the injection member being at least partially displaced in translation in the longitudinal direction (X) from the first injection position to the second injection position , thus releasing the additional injection space between the distal end of the portion of the injection member moving in translation or of the injection member and the main body of the bi-material cover thus formed;

injecting the second material into the injection mold, the second material being injected into the additional injection space via the injection duct of the injection member, so as to form the secondary body of the bi-material hood; . The invention also relates to a bi-material cap for a vial, in particular for a vial intended to contain a cosmetic product, obtained by the implementation of a manufacturing method as previously described.

The invention will be better understood, and other objects, details, features and advantages thereof will become more clearly apparent in the following detailed explanatory description of at least one embodiment of the invention given to As a purely illustrative and non-limiting example, with reference to the accompanying schematic drawings.

On these drawings:

FIG. 1 is a longitudinal sectional view of a bi-material injection mold according to one embodiment of the invention, in a first configuration;

FIG. 2 is a longitudinal sectional view of the bi-material injection mold shown in FIG. 1 in a second configuration;

FIG. 3 is a cross-sectional view of a first molding part of the bi-material injection mold shown in FIG. 1;

FIG. 4 is a perspective view of a bi-material hood obtained by injecting a first and a second material into the bi-material injection mold shown in FIGS. 1 to 3;

FIG. 5 is a perspective view of a main body of the bi-material hood shown in FIG. 4;

FIG. 6 is a perspective view of a secondary body of the bi-material hood shown in FIG. 4;

FIG. 7 is a flow diagram of a process for manufacturing a bi-material hood using the bi-material injection mold shown in FIGS. 1 to 3. FIGS. 1 to 3 show a bi-material injection mold 10 material for a hood

100 bi-material according to one embodiment of the invention. The cover 100 bi-material, also called bi-material cap, is for example designed to be fixed on the neck of a bottle (not shown) or a bottle for (e) containing a cosmetic product. An example of a bi-material cover 100 made by injection into the injection mold 10 is illustrated in FIGS. 4 to 6.

The bi-material cover 100 comprises a main body 101 made from a first material and comprising a side wall 102 extending around a longitudinal extension direction X and a bottom wall 103 closing or obstructing the a 104 of the ends of the side wall 102 in the direction of longitudinal extension X. The bottom wall 103 is for example arranged perpendicularly to the direction of longitudinal extension X. The main body 101 of the cover 100 bi-material is illustrated alone in Figure 5.

The cover 100 bi-material further comprises a secondary body 105 made from a second material different from the first material. The secondary body 105 of the bi-material cover 100 is shown alone in FIG.

The secondary body 105 of the bi-material cover 100 may further comprise at least one outer portion 106 arranged against an outer surface of the main body 101, in particular at least partly against an outer lateral surface 107 of the main body 101. The outer lateral surface 107 corresponds to the outer surface of the side wall 102.

The or each of the outer portions 106 of the secondary body 105 may be arranged only against the outer lateral surface 107 of the main body 101 or may be arranged partly against the outer lateral surface 107 and partly against the outer surface 108 of the wall background 103.

In the remainder of the description, an outer surface of the main body 101 and the outer lateral surface 107 of the main body 101 will be distinguished, the outer surface of the main body 101 comprising both the outer surface of the lateral wall 102, that is, the outer side surface 107, and the outer surface 108 of the bottom wall 103.

Where appropriate, the following description will also be distinguished in the following description an outer surface of the injection hood 100 and the outer surface of the main body 101, the outer surface of the injection hood 100 comprising both the surface exterior of the main body 101 and an outer surface 109 of the secondary body 105.

A maximum dimension of the cover 100 bi-material in the direction of longitudinal extension X is for example less than or equal to 100mm, especially less than or equal to 50mm. This dimension is for example between 40 and 50mm.

A maximum dimension of the bi-material hood 100 taken radially relative to the direction of longitudinal extension X is for example less than or equal to 100 mm, in particular less than or equal to 50 mm. This dimension is for example between 20 and 30mm.

"Different materials" means materials that do not have the same chemical composition.

"Different materials" can also be understood to mean materials which do not have the same mechanical and / or physical and / or optical properties, such as hardness, ductility, elasticity, surface condition (roughness), mass volume, color or brilliance.

The first and second materials comprise for example one or more plastics, especially thermoplastics.

The first material comprises for example polypropylene (also called

"PP") and the second material comprises for example a thermoplastic elastomer (also called "TPE").

The injection mold 10 has a first configuration in which the first material is injected into the injection mold 10 (FIGS. 1 and 3) and a second configuration in which the second material is injected into the injection mold 10 (FIG. 2).

The injection mold 10 comprises an injection member 11, 12 and a first molding piece 13.

The injection member 11, 12 has a generally cylindrical shape extending in the direction of longitudinal extension X between a distal end 14, 20 and a proximal end 15, 21. The injection member 11, 12 further comprises an injection duct 17, 23 extending between an inlet orifice 18 arranged at the proximal end 15, 21 of the injection member 1 1, 12 and an outlet 25 arranged in the direction of longitudinal extension X or parallel to this direction at the distal end 14, 20 of the injection member 1 1, 12.

The outlet 25 of the injection duct 17, 23 of the injection member 11, 12 forms the injection point of the injection mold 10.

The first molding part 13 has a bell shape.

The first molding piece 13 is adapted to be attached, in the first configuration of the injection mold 10, around the injection member 11, 12, the first molding piece 13 extending around the direction of injection. longitudinal extension X, when said first molding part 13 is attached around the ring 12.

The first molding part 13 comprises an inner surface 26 defining a first hollow recess of complementary shape with the outer surface of the main body 101 of the bi-material cover 100, so as to form said outer surface of the main body 101, when the first material is injected into the injection mold.

The injection member 11, 12 is at least partly designed to move in translation in the longitudinal extension direction X relative to the main body 101 of the bi-material cover 100 formed in the first configuration of the injection mold. 10, between a first injection position in which the injection mold 10 is in the first configuration (Figure 1), the first material being injected into the injection mold 10, and a second injection position in which the mold 10 injection is in the second configuration (Figure 2), the second material being injected into the mold 10 injection.

When the injection member 11, 12 is in the second injection position (FIG. 2), the distal end 20 of the portion 12 of the injection member 11, 12 moving in translation or the injection member 11, 12 is arranged at a distance from the bottom wall 103 of the main body 101 of the bi-material cover 100 formed in the first configuration of the injection mold 10. In this way, the distal end 20 of the portion 12 of the injection member 1 1, 12 moving in translation or of the injection member January 1, 12 releases an additional injection space 22 on which the injection duct 17, 23 of the injection member 11, 12 opens out via the outlet orifice 25. The second material is thus injected from the outlet orifice 25 of the injection duct 17, 23 into the additional injection space 22.

The secondary body 105 of the bi-material cover 100 formed in the second configuration of the injection mold 10 thus comprises an inner portion 15 of complementary shape with the additional injection space 22 (FIG. 2).

In this way, the injection mold 10 makes it possible to inject the first material and the second material, via the injection conduits 17, 23 of the injection member 11, 12, from inside the hood 100 bi-material and not the outside of the hood 100 bi-material.

The injection mold 10 thus makes it possible to obtain a bi-material cover 100 without injection point visible from the outside of said bi-material cover 100. Indeed, the injection point of the main body 101 of the bi-material cover 100 will be located on the inner surface 1 14 of the bottom wall 103 of said main body 101 while the injection point of the secondary body 105 will be located on the inner portion 1 15 of said secondary body 105. The injection point is not visible from outside the hood 100 bi-material, it is not likely to give a user the impression that the hood 100 bi-material lack of finishing and therefore to give it a negative image of the product, especially the cosmetic product, housed in the bottle closed by the cover 100 bi-material.

In addition, the injection mold 10 makes it possible to inject the first and second materials with the same injection conduit 17, 23. This is particularly advantageous when the dimensions of the bi-material hood 100 to be made are small, so that that it becomes difficult to use a different injection pipe by material to be injected.

The distal end 20 of the portion 12 of the injection member 1 1, 12 moving in translation or the injection member 1 1, 12 moves for example between the first injection position and the second injection position of a distance in the direction of longitudinal extension X between 0.50 and 1 .00mm, for example 0.67mm.

The injection member comprises for example a fixed injection core 1 1 and a ring 12 movable relative to the injection core January 1.

The injection core 11 has a generally cylindrical shape extending in the direction of longitudinal extension X between a distal end 14 and a proximal end 15.

The injection core 11 comprises a lateral surface 16.

The injection core 11 comprises an injection conduit 17 extending between an inlet orifice 18 arranged at the proximal end 15 of the injection core 11 and an outlet orifice 19 arranged at the level of the distal end 14 of the injection core 11 on the lateral surface 16 of said injection core 11. The first and second materials are injected into the injection mold via the inlet port 18.

The ring 12 has a generally tubular shape extending around the direction of longitudinal extension X.

The ring 12 further has a distal end 20 and a proximal end 21 in the direction of longitudinal extension X.

The ring 12 is mounted to move in translation on the injection core 1 1 in the direction of longitudinal extension X. The ring 12 is more precisely designed to slide along the injection core 1 1 in the direction of longitudinal extension. X between a first injection position in which the injection mold 10 is in the first configuration (Figure 1), the first material being injected into the injection mold 10, and a second injection position in which the mold 10 to injection is in the second configuration (Figure 2), the second material being injected into the injection mold 10. An inner surface of the ring 12 slides along the side surface 16 of the injection core 11.

The distal end 20 of the ring 12 is closer to the proximal end 15 of the injection core 11 in the second injection position than in the first injection position (FIGS. 1 and 2). In this way, the distal end 20 of the ring 12 releases an additional injection space 22 (FIG. 2), when said ring 12 is in the second injection position, this additional injection space 22 being blocked by the distal end 20 of the ring 12, when the ring 12 is in the first injection position.

The ring 12 further comprises an injection pipe 23 extending between an inlet orifice 24 in fluid communication with the outlet orifice 19 of the injection pipe 17 of the injection core January 1, when the ring 12 is in the first and second injection positions, and an outlet port 25 arranged parallel to the longitudinal extension direction X at the distal end 20 of the ring 12.

In this way, the injection pipes 17, 23 of the injection core 11 and of the ring 12 are in fluid communication with each other so that the ring 12 is in the first injection position or in the second injection position (Figures 1 and 2). The outlet 25 of the injection conduit 23 of the ring 12 forms the injection point of the injection mold 10.

It will be further understood that when the injection mold 10 is in the second configuration, the distal end 20 of the ring 12 having released the additional injection space 22, the outlet port 25 of the injection conduit 23 of the the ring 12 opens onto the additional injection space 22 or is in fluid communication with the additional injection space 22 (Figure 2).

Thus, the secondary body 105 of the bi-material cover 100 formed in the second configuration of the injection mold 10 comprises an inner portion 1 15 of complementary shape with the additional injection space 22 (Figure 2).

In this way, the injection mold 10 makes it possible to inject the first material and the second material, via the injection pipes 17, 23 of the injection core 11 and the ring 12, from the inside. the cover 100 bi-material and not from outside the hood 100 bi-material.

The injection mold 10 thus makes it possible to obtain a bi-material cover 100 without injection point visible from the outside of said bi-material cover 100. Indeed, the injection point of the main body 101 of the bi-material cover 100 will be located on the inner surface 1 14 of the bottom wall 103 of said main body 101 while the injection point of the secondary body 105 will be located on the inner portion 1 15 of said secondary body 105. The injection point is not visible from outside the cover 100 bi-material, it is not likely to give a user the impression that the hood 100 bi-material lack of finish and therefore of give it a negative image of the product, in particular the cosmetic product, housed in the bottle closed by the bi-material hood 100.

In addition, the injection mold 10 makes it possible to inject the first and second materials with the same injection duct formed by the injection ducts 17, 23 communicating with the injection core 11 and the ring 12. This is particularly advantageous when the dimensions of the bimetallic cover 100 to be made are small, so that it becomes difficult to use a different injection conduit for the material to be injected.

It will be understood that the distal end 14 of the injection core 11 and the distal end 20 of the ring 12 together form the distal end 14, 20 of the injection member 11, 12 and that the end proximal 15 of the injection core 1 1 and the proximal end 21 of the ring 12 together form the proximal end 15, 21 of the injection member 1 1, 12.

Similarly, the injection duct 17 of the injection core 11 and the injection duct 23 of the ring 12 together form the injection duct 17, 23 of the injection member 11, 12.

The distal end 20 of the ring 12 moves for example between the first injection position and the second injection position by a distance in the direction of longitudinal extension X of between 0.50 and 1 .00 mm, for example of 0.67mm.

The first molding part 13 comprises for example a pair of drawers 13a, 13b in the form of a half-bell.

When the injection mold 10 is in the first configuration, the drawers 13a, 13b are designed to move in translation relative to each other in a transverse direction Y, perpendicular to the direction of longitudinal extension X, between a close position in which the drawers 13a, 13b continuously form the inner surface 26 defining the first imprint and a spaced apart position in which the drawers 13a, 13b are arranged at a distance from each other (Figure 3).

The first molding part 13 comprises for example a projection 32 or a plurality of projections 32 extending from the inner surface 26 of the first molding part to the additional injection space occupied by the distal end 20. of the injection member 1 1, 12, in particular of the ring 12, when the injection mold 10 is in the first configuration (FIG. 3).

In this way, the main body 101 of the bi-material cover 1 00 made by injecting the first material into the injection mold 10 in its first configuration has at least one channel 1 connecting the additional injection space 22 to a zone 1 1 1, said receiving zone, formed in the outer surface of the main body 101, in particular at least in part in the outer lateral surface 107 of the main body 101, and intended to receive or to accommodate the or one of the portions external 106 of the secondary body 105 (Figure 5).

Thus, when the injection mold 10 is in the second configuration, the distal end 20 of the injection member 11, 12, in particular of the ring 12, having released the additional injection space 22, the second The material, injected into the injection mold 10, joins the at least one receiving zone 11 of the outer lateral surface 107 of the main body 101 to form the outer portion or portions 106 of the secondary body 105, via the additional injection space 22 and the channel (s) 1 10 formed in the main body 101 of the bi-material cover 100.

The secondary body 105 obtained in the second configuration of the injection molding mold 10 thus comprises one or more branches 1 16 extending from the complementary-shaped interior portion 1 15 with the additional injection space 22 to the the outer portions 106 (Figure 6).

The or each of the receiving areas January 1 forms for example a housing whose edges define the contour of the outer portion 106 of the secondary body 105 of the bi-material cover 100 or a boundary between the outer surface 108 of the secondary body 105 and the outer surface of the main body 101 of the cover 100 bi-material. In this way, the channel (s) 1 10 formed in the main body 101 of the bi-material cover 100 thus give access to the outside of the main body 101 from the inside of said main body 101 for the injection of the second material.

The injection mold 10 thus makes it possible to produce the outer portion or portions 106 of the secondary body 105 of the bi-material cover 100 by injecting the second material from the inside of the bi-material cover 100, the injection point of the secondary body 105. remaining invisible from the outside of the hood 100 bi-material.

In addition, the injection mold 10 makes it possible to produce outer portions 106 of the secondary body 105 of the bi-material cover 100 which are not interconnected on the outside of the bi-material hood 100 or which are not continuous on the outer periphery of the cover 100 bi-material, said outer portions 106 being interconnected only via the branches 1 16 and the inner portion 1 15. It is sufficient to achieve an outer portion 106 of the secondary body 105 of the hood 100 bi-material of a single projection 32 and therefore of a single channel 1 10 made in the main body 101 of the cover 100 bi-material connecting the additional injection space 22 to the receiving zone 1 1 1, so it is possible to associate a projection 32 and therefore a channel 1 10 per outer portion 106 to be produced.

It will be understood that the number of projections as well as their arrangement relative to one another depends directly on the number and arrangement of the receiving zones 11 to be formed in the outer lateral surface 107 of the main body 101 of the bi-material hood 100. and therefore the number and the disposition of the outer portions 106 of the secondary body 105 to be formed.

The cover 100 bi-material comprises for example a secondary body 105 itself comprising four outer portions 106 each connected to the inner portion 1 15 through a branch 1 16 (Figures 4 and 6). The outer portions 106 are for example regularly distributed around the direction of longitudinal extension X. When the injection mold 10 is in the first configuration, the projection 32 or each of the projections 32 of the first molding part 13 extends by example in a direction of transverse extension Yi, Y ₂ substantially perpendicular to the direction of longitudinal extension X, the directions of transverse extension Yi, Y ₂ of each of the projections 32 being parallel or merged with each other (Figure 3). The or the directions of transverse extension Y ₁ , Y ₂ are for example substantially parallel or merged with the transverse direction Y, so as to facilitate demolding of the first molding part 13.

In this way, the channel 1 or each of the channels 1 10 formed in the main body 101 of the bi-material cover 100 in the first configuration of the injection mold 10 extends in a direction of transverse extension Y ₁ , Y ₂ substantially perpendicular to the direction of longitudinal extension X, the directions of transverse extension Yi, Y ₂ of each of the channels 1 10 being substantially parallel or merged with each other (Figure 5).

The secondary body 105 obtained in the second configuration of the injection molding mold 10 thus comprises one or more branches 1 16 extending themselves in a direction of transverse extension Y ₁ , Y ₂ substantially perpendicular to the direction of longitudinal extension X, the directions of transverse extension Yi, Y ₂ of each of the branches 1 16 being substantially parallel or merged with each other (FIG. 6).

The branches 1 16 of the secondary body 105 extend for example two by two in an opposite direction in the same direction of transverse extension Yi, Y ₂ (Figures 4 and 6). The injection mold 10 may also comprise a second molding piece 27 having a bell shape (FIG. 2).

The second molding piece 27 is designed to be attached, in the second configuration of the injection mold 10, around the injection member January 1, 12, including the crown 12, and the main body 101 of the hood 100 bi -material formed in the first configuration of the injection mold 10, the second molding piece 27 extending around the longitudinal extension direction X, when said second molding piece 27 is attached around the ring 12.

The second molding piece 27 comprises an inner surface 28 defining a second hollow recess of complementary shape with the outer surface of the bi-material hood 100, the second recess being designed to define with the outer surface of the main body 101 of the hood 100 bi-material material, in particular with at least the outer lateral surface 107 of the main body 101, formed in the first configuration of the injection mold 10 to at least one hollow of complementary shape with the or one of the outer portions 106 of the body secondary 105 of the hood 100 bi-material. The hollow or recesses are located opposite the receiving zone or zones 1 1 1 formed in the outer surface, in particular in the outer lateral surface 107, of the main body 101 of the bi-material cap 100.

In this way, when the second material is injected into the mold, the second material joins the hollow or recesses through the additional injection space 22 released by the distal end 20 of the injection member 1 1, 12, in particular of the ring 12, of the channel (s) 1 10 formed in the main body 101 of the bi-material cover 100 and of the receiving zone (s) 1 1 1 formed in the outer lateral surface 107 of the main body 101 of the hood 100 bi-material.

The second molding piece 27 comprises for example a pair of drawers in the shape of a half-bell.

When the injection mold 10 is in the second configuration, the drawers are designed to move in translation relative to each other in the transverse direction Y, between a close position in which the drawers continuously form the surface. internal 28 defining the second imprint and a remote position in which the drawers are arranged at a distance from one another.

The distal end 20 of the ring 12 is for example protruding from the distal end 14 of the injection core 1 1 in the direction of longitudinal extension X, when the ring 12 is in the first injection position, so as to form a groove 1 13 in an inner surface 1 14 of the bottom wall 103 of the main body 101 of the cover 100 bi-material, when the injection mold 10 is in the first configuration (Figure 1).

The distal end 20 of the ring 12 and the distal end 14 of the injection core 11 are for example arranged in the same plane P orthogonal to the direction of longitudinal extension X, when the ring 12 is in the second position. Injection (Figure 2).

In this way, the groove 1 13 formed in the bottom wall 103 of the main body 101 of the bi-material cover 100 in the first configuration of the mold 10 to injection and the distal end 20 of the ring 12 together define the additional injection space 22, when the ring 12 is in the second injection position and therefore the injection mold 10 in the second configuration.

Thus, the inner portion 1 of the secondary body 105 of the bi-material cover 100 formed in the second configuration of the injection mold 10 has an annular shape, complementary to the groove 1 13 of the main body 101 of the bi-material cover 100 where it is housed (Figure 6).

The injection mold 10 may further comprise a fixed, generally tubular core 29 mounted around the injection member 11, 12, in particular of the ring 12, and extending around the direction of longitudinal extension X when the injection mold 10 is in the first and in the second configuration (FIGS. 1 and 2). Where appropriate, the ring 12 is thus movable in translation in the direction of longitudinal extension X with respect to the injection core 11 and the core 29.

The core 29 comprises an outer lateral surface 30 of complementary shape with an inner lateral surface 1 17 of the main body 101 of the bi-material cover 100, so as to form said inner lateral surface 1 17 of the main body 101, when the first material is injected into the injection mold.

The core 29 comprises in the direction of longitudinal extension X a distal end 33 and a proximal end 34.

The distal end 33 of the core 29 and the distal end 14 of the injection core 11 are for example arranged in the plane P, when the injection mold 10 is in the first and in the second configuration.

The distal end 14 of the injection core 1 1, the distal end 20 of the ring 12 and, if appropriate, the distal end 33 of the core 29 together define a surface of complementary shape with the inner surface 1 14 of the wall of FIG. bottom 103 of the main body 101 of the cover 1 00 bi-material, when the injection mold 10 is in the first configuration. The outer side surface 30 of the core 29 may also include an undercut 35 extending circumferentially around the longitudinal extension direction X (FIGS. 1 and 2).

The undercut 35 is for example formed by a groove arranged around the core 29. The main body 101 of the cover 100 bi-material comprising a projection 1 18 of complementary shape with said groove, said projection 1 18 extending around the direction of longitudinal extension X from the inner side surface 1 17 of the main body 101.

The fact that the main body 101 of the bi-material cover 100 is held in position on the core 29 when the injection mold 10 is in the second configuration allows the use of the undercut 35. In fact, the effort to provide to dismantle the hood 100 bi-material core 29 remains acceptable even with the undercut 35 which would not be the case if after disassembly of the main body 101 back to another core which should also have a counter - bare.

FIG. 7 shows an exemplary method 200 for manufacturing the bi-material cover 100 implementing the injection mold 10.

The method 200 comprises the following steps:

- Implementation 201 of the injection mold 10 in the first configuration, the first molding part 13 being positioned around the injection member

1 1, 12 and the injection member 1 1, 12 being in the first injection position;

injection 202 of the first material into the injection mold 10, the first material being injected into the first hollow cavity of the first molding part 13 via the injection pipes 17, 23 of the injection member 11,

12, so as to form the main body 101 of the cover 100 bi-material;

- Implementation 203 of the injection mold 10 in the second configuration, the injection member 1 1, 12 being at least partially displaced in translation in the longitudinal direction X from the first injection position to the second injection position, thus releasing the additional injection space 22 between the distal end 20 of the portion 12 of the injection member 1 1, 12 moving in translation or the injection member 1 1 , 12 and the main body 101 of the bimetallic cover 100 thus formed; injection 204 of the second material into the injection mold 10, the second material being injected into the additional injection space 22 via the injection pipe 17, 23 of the injection member 11, 12, so that forming the secondary body 105 of the bi-material cover 100.

During the step of setting up the injection molding mold 201 in the first configuration, the first molding part 13 is for example positioned around the ring 12 and the injection core 11, and if necessary the core 29, the ring 12 being in the first injection position.

During the injection step 202 of the first material in the injection mold 10, the first material is for example injected into the first hollow cavity of the first molding part 13 via the injection conduits 17, 23 of the injection mold. injection 1 1 and the ring 12, so as to form the main body 101 of the bimetallic cover 100 thus formed.

During the implementation step 203 of the injection mold 10 in the second configuration, the ring 12 is for example slid from the first injection position to the second injection position, thus freeing up the additional space injection 22 between the distal end 20 of the ring 12 and the main body 101 of the cover 100 bi-material.

When the injection mold 10 is placed in the second configuration, the second molding piece 27 is for example positioned around the main body 101 of the bi-material cover 100, the ring 12 and the injection core 11.

When the injection mold 10 is placed in the second configuration, the main body 101 of the bimetallic cover 100 is held in position around the injection member 11, 12, where appropriate the core 29.

During the injection step 204 of the second material in the injection mold 10, the second material is for example injected into the additional injection space 22 via injection pipes 17, 23 of the injection core. 11 and the ring 12, so as to form the secondary body 105 of the bi-material cover 100.

During the injection step 204 of the second material, the second material is injected into the hollow or recesses defined between the second cavity of the second molding piece 27 and the external lateral surface 106 of the main body 101 of the bonnet 100. material formed during the injection step 202 of the first material, via the injection pipes 17, 23 of the injection core 1 1 and the ring 12, the additional injection space 22 released by the end distal 20 of the ring 12 and the channel or channels 1 10 formed in the main body 101 during the step of injection 202 of the first material, so as to form the secondary body 105 of the bi-material cover 100. More specifically, the inner portion 1 1 5 of the secondary body 105 of the bi-material cover 100 is formed in the additional injection space 22, or the branches 1 16 of the secondary body 105 are formed in the channel (s) 10. of the main body 101 and the outer portion or portions 106 of the secondary body 105 are formed in the hollow or recesses.

It should also be noted that alternative embodiments are of course possible without departing from the scope of the present invention. In particular, it is also possible, in additional exemplary embodiments, to provide for the projection or projections of the first molding part 13 to extend in a direction parallel to the direction of longitudinal extension X, with no protrusion extending into the extension of the outlet 25 of the ring 12, the projection or projections for producing in the main body 101 of the bi-material cover 100 at least one channel connecting the additional injection space 22 to a zone formed in the less in part in the outer surface 108 of the bottom wall 103 of the main body 101, said zone being intended to receive or to accommodate an outer portion of the secondary body 105.

Claims

claims

1. Bi-material injection mold (10) for a bimetallic cover (100) for closing a vial, in particular a vial containing a cosmetic product, the bi-material cap (100) comprising:

a main body (101) made from a first material and comprising a side wall (102) extending about a longitudinal extension direction (X) and a bottom wall (103) covering a (104) ends of the side wall (102) in the direction of longitudinal extension (X), and

a secondary body (105) made from a second material different from the first material,

the injection mold (10) having a first configuration in which the first material is injected into the injection mold (10) and a second configuration in which the second material is injected into the injection mold (10),

the injection mold (10) being characterized in that it comprises:

- a generally cylindrical injection member (1 1, 12), extending in the direction of longitudinal extension (X) between a distal end (14, 20) and a proximal end (15, 21) and comprising a duct injection device (17, 23) extending between an inlet port (18) arranged at the proximal end (15) of the injection member (1 1) and an outlet port (25) arranged in the direction of longitudinal extension (X) or parallel to the direction of longitudinal extension (X) at the distal end (20) of the injection member (12),

a first bell-shaped molding part (13) designed to be attached around the injection member (1 1, 12) in the first configuration of the injection mold (10), the first molding part (13) ) extending around the longitudinal extension direction (X), when said first molding piece (13) is attached around the injection member (1 1, 12), the first molding piece (13) comprising an inner surface (26) defining a first hollow recess of complementary shape with an outer surface of the main body (101) of the bi-material cover (100) molding, so as to form said outer surface of the main body (101) of the bi-material cover (100), when the first material is injected into the injection mold (10),

the injection member (12) being at least partly designed to move in translation in the direction of longitudinal extension (X) relative to the main body (101) of the cover (100) bi-material formed in the first configuration of the injection mold (10), between a first injection position in which the injection mold (10) is in the first configuration and a second injection position in which the injection mold (10) is in the second configuration, the distal end (20) of the part of the injection member (12) moving in translation or of the injection member being arranged at a distance from the bottom wall (103) of the main body ( 101) of the bi-material cover (100) formed in the first configuration of the injection mold (10), when the injection member (12) is in the second injection position, so as to release an additional space of injection (22) on which the injection conduit (17, 23) of the injection member (1 1, 12) via the outlet orifice (25).

Injection mold (10) according to claim 1, wherein the injection member (1 1, 2) comprises:

a globally cylindrical fixed injection core (1 1) extending in the direction of longitudinal extension (X) between a distal end (14) and a proximal end (15) and comprising an injection conduit ( 17) extending between an inlet port (18) arranged at the proximal end (15) of the injection core (1 1) and an outlet port (19) arranged at the distal end (14) the injection core (1 1) on a side surface (16) of said injection core (1 1),

a generally tubular crown (12) extending around the direction of longitudinal extension (X) and having a distal end (20) and a proximal end (21) in the direction of longitudinal extension (X), the crown (12) being designed to slide along the injection core (1 1) in the longitudinal extension direction (X) between a first injection position in which the injection mold (10) is in the first configuration and a second injection position in which the mold (10) injection is in the second configuration, the distal end (20) of the ring (12) being closer to the proximal end (15) of the injection core (1 1) in the second injection position than in the first injection position, so that the distal end (20) of the ring (12) releases an additional injection space (22), when said ring (12) is in the second injection position, the ring (12) further comprising an injection conduit (23) extending between an inlet (24) in fluid communication with the outlet port (1 9) of the core injection conduit (17) injection (1 1), when the ring gear (12) is in the first and second injection positions, and an outlet port (25) arranged parallel to the direction of longitudinal extension (X) at the level of the distal end (20) of the crown (12).

Mold (10) according to claim 1 or claim 2, wherein:

the secondary body (105) of the bi-material cover (100) comprises at least one outer portion (106) arranged against an outer surface of the main body (101) of said bi-material cover (100),

the first molding part (13) further comprises at least one projection (32) extending from the inner surface (26) of the first molding part (13) to the additional injection space (22). ) occupied by the distal end (20) of the injection member (1 1, 12) or the ring (12), when the injection mold (10) is in the first configuration, so as to realize in the main body (101) of the bi-material cover (100) has at least one channel (109) connecting the additional injection space (22) to a zone (1 1 1), called the receiving zone, formed in the surface outside the main body (101) and intended to receive the one or one of the outer portions (106) of the secondary body (105), the second material joining the receiving zone or zones (1 1 1), to form therein the outer portions (106) of the secondary body (105), via the additional injection space (22) and the formed channel (1 10) in the main body (101) of the bi-material hood (100), when the injection mold (10) is in the second configuration.

Mold (10) according to claim 3, wherein: the outer portion or portions (106) of the secondary body (105) of the bi-material cover (100) are arranged at least partly against an outer lateral surface (107) of the main body (101) of said cover (100) material,

the protrusion (32) or each of the projections (32) of the first molding part (13) extends in a direction of transverse extension (Yi, Y ₂ ) substantially perpendicular to the direction of longitudinal extension (X) , the directions of transverse extension (Yi, Y ₂ ) of each of the projections (32) being substantially parallel or merged with each other.

The mold (10) according to claim 3 or claim 4, further comprising a second bell-shaped molding piece (27) adapted to be attached, in the second configuration of the injection mold (10), around the injection member (1 1, 12) and the main body (101) of the bi-material cover (100) formed in the first configuration of the injection mold (10), the second molding part (27) extending around the direction of longitudinal extension (X), when said second molding piece (27) is attached around the injection member (1 1, 12), the second molding piece (27) comprising an inner surface (27) defining a second hollow recess of complementary shape with an outer surface of the bi-material cover (100) to be molded, the second recess being designed to define with the outer surface of the main body (101) of the cover (100) bi-material material formed in the first configuration of the mold (10) at i injecting at least one recess of complementary shape with the one or one of the outer portions (106) of the secondary body (105) of the bi-material cover (100) to be molded.

The mold (10) according to claim 2 or claim 2 in combination with any one of claims 3 to 5, wherein the distal end (20) of the ring gear (12) protrudes from the end distal (14) of the injection core (1 1) in the direction of longitudinal extension (X), when the ring (12) is in the first injection position, so as to form a groove (1 13) in an inner surface (1 14) of the bottom wall (103) of the main body (101) of the bi-material hood (100), when the injection mold (10) is in the first configuration.

The mold (10) according to claim 6, wherein the distal end (20) of the ring (12) and the distal end (14) of the injection core (1 1) are arranged in the same plane (P) orthogonal to the direction of longitudinal extension (X), when the ring (12) is in the second injection position, the groove (1 13) formed in the bottom wall (103) of the main body (101) of the bi-material cover (100) in the first configuration of the mold (10) and the distal end (20) of the ring (12) together defining the additional injection space (22), when the injection mold (10) is in the second configuration.

The mold (10) according to any one of claims 1 to 7, further comprising a fixed, generally tubular, core (29) mounted around the injection member or crown (12) and extending around the direction of longitudinal extension (X), the core (29) comprising an outer lateral surface (30) of complementary shape with an inner lateral surface (1 17) of the main body (101) of the cover (100) bi- molding material.

The mold (10) of claim 8, wherein the outer side surface (30) of the core comprises an undercut (35) extending circumferentially about the longitudinal extension direction (X).

Mold (10) according to any one of claims 1 to 9, wherein:

the first molding part (13) comprises a pair of drawers (13a, 13b) in the form of a half-bell, the drawers (13a, 13b) being designed to move in translation relative to one another following a transverse direction (Y), perpendicular to the direction of longitudinal extension (X), when the injection mold (10) is in the first configuration, between a close position in which the drawers (13a, 13b) form in a continuous manner the inner surface (26) defining the first cavity and a spaced apart position in which the drawers (13a, 13b) are arranged at a distance from one another, and / or

the second molding piece (27) comprises, for example, a pair of semi-bell-shaped drawers, the drawers being designed to move in translation relative to one another in the transverse direction (Y), when the injection mold (10) is in the second configuration, between a close position in which the drawers continuously form the inner surface (28) defining the second footprint and a spaced apart position in which the drawers are arranged at a distance from one another.

1 1. The mold (10) of claim 4 and claim 10, wherein the one or more transverse directions (Y ₁ , Y ₂ ) are substantially parallel to or coincident with the transverse direction (Y).

12. A method (200) for manufacturing a cover (100) bi-material, characterized in that it implements a mold (10) bi-material injection according to any one of claims 1 to 1 1, the method (200) comprising the following steps of:

- Placing (201) the injection mold (10) in the first configuration, the first molding part (13) being positioned around the injection member (1 1, 12) and the injection member (1 1, 12) being in the first injection position;

- injecting (202) the first material into the injection mold (10), the first material being injected into the first hollow cavity of the first molding part (13) via the injection conduits (17, 23) of the injection member (1 1, 12), so as to form the main body (101) of the bi-material cover (100);

- placing (203) the mold (10) injection in the second configuration, the injection member (1 1, 12) being at least partially displaced in translation in the longitudinal direction (X) from the first position of injection to the second injection position, thus releasing the additional injection space (22) between the distal end (20) of the portion (12) of the injection member (1 1, 12) moving in translation or that of the injection member and the main body (101) of the bimetallic cover (100) thus formed;

- injection (204) of the second material into the mold (10) injection, the second material being injected into the additional injection space (22) via the injection conduit (17, 23) of the body of injection injection (1 1, 12), so as to form the secondary body (105) of the hood (100) bi-material.

13. Bi-material cap (100) for a bottle, in particular for a bottle intended to contain a cosmetic product, characterized in that it is obtained by the implementation of the manufacturing method according to claim 12.