WO2015092156A1

WO2015092156A1 - Profile section moulded by multishot injection forming a seal or a trim element for a motor vehicle, method and mould for manufacturing same

Info

Publication number: WO2015092156A1
Application number: PCT/FR2013/053100
Authority: WO
Inventors: Yannick BURGUET; Olivier Blottiau
Original assignee: Hutchinson
Priority date: 2013-12-16
Filing date: 2013-12-16
Publication date: 2015-06-25

Abstract

The present invention relates to a profile section (10") moulded by multishot injection of thermoplastic materials with different hardnesses (M1 and M2) forming a seal or a trim element for a body of a motor vehicle, a method for manufacturing said profile section and a mould for implementing same. Said profile section includes at least: an anti-friction coating (13) closely bonded to a longitudinal sealing surface (12) of the profile section and intended for sealingly engaging a movable element of the vehicle and/or a decorative film (15) closely bonded to a visible longitudinal surface (11") of the profile section mounted on the vehicle and intended for enhancing the appearance of said visible surface, which is separate from said sealing surface, at least one of said materials (M1) being overmoulded, a transverse body being overmoulded on said coating and/or said film. According to the invention, at least one gap (14, 14") in said at least one overmoulded material (M1) extends through said body substantially until reaching said coating and/or film, while still being surrounded by said body.

Description

MULTI-INJECTION MOLD PROFILE FORMING A SEAL OR A TRIM FOR A MOTOR VEHICLE,

METHOD AND MOLD FOR MANUFACTURING THE SAME The present invention relates to a multi-injection molded section of thermoplastic materials of different hardnesses forming a seal or embellisher for a motor vehicle body with one or more surfaces antifriction and / or enhanced appearance, a method of manufacturing this profile and a mold for its implementation. The invention applies to all seals used on such vehicles, in particular those chosen from internal and external liner, slides, double seals, and also to all hubcaps fitted to these vehicles such as hubcaps door frame, liner, slide or fixed window (eg rear side fixed rear window trim or tailgate window, or windshield or rear window trim).

A car body seal typically has the following functions:

that of holding on its support, which is formed of an element of the body, this holding function is generally provided by a rigid portion formed of a U-section clamp or a generally flat base having openings for the passage of clips or intermediate fastening clips on the support;

that of ensuring, via a "sliding" surface, a sealed contact between this support and a fixed or movable glazing or another element of the bodywork (for example between a door panel and a sliding window in the case of an interior liner or outside, or between a door frame and a body side in the case of a "between-frames" joint, an "upper flush" joint or a "water jet" joint), this sealed contact being generally obtained by a zone of flexible material on which there is an antifriction coating very often made of floc; and that of presenting on its or each of its visible faces a coating of surface appearance pleasing to the eye which is harmonized with the surrounding parts and which is also durable, not losing its appearance qualities over time.

This antifriction coating is currently the result of either an "on-line" removal of glue and then flock hairs (generally made of polyamide or polyether sulphone), or the rolling of a flocked strip, both of which processes can be implemented. :

- for extruded joints, in-line during extrusion, or - for molded joints, in recovery during an additional operation succeeding a multi-injection molding of each joint.

As for the appearance coating, it can be obtained either in the form of a film by rolling on an extruded gasket or by painting, for example, or by adding an added trim to give the gasket the desired appearance.

A major disadvantage of the removal or rolling of these coatings on profiles, in line as in recovery, lies in the prior activation of the support which is generally required to allow adhesion of the glue or tape. In addition, it is often observed that the punch-die-type punch-out cut generally made for finishing the extruded joint, in addition to its additional cost, can give rise to detachments of the strip, this detachment being accentuated by the daily use more. or less intensive seal once mounted on the vehicle (eg sliding, vibration, hand contact, in particular).

Another disadvantage inherent to the on-line removal processes is that the extrusion which is necessarily used in this case does not make it possible to produce a piece of non-constant section, or to treat "hidden" (ie non-accessible) zones of a profiled by surfaces antifriction or enhanced appearance, and also does not allow to simultaneously treat, on the one hand, the longitudinal face of the profile to be provided with an antifriction coating or that to provide a film of appearance and on the other hand, the rounded or angular end slices of this section. As for the existing bi-injection processes, they have the disadvantage of not providing for the simultaneous use of several bands, nor the coating of the end slices of the profiles. In fact, the vignettes applied to date at the bottom of the bi-injection molds cover only the longitudinal face concerned (quasi-flat or curved) of the profile.

Document WO-A1 -2012 / 153234 in the name of the Applicant has satisfactorily remedied this disadvantage by proposing a multi-injection overmoulding, in a single rotating mold with fixed and moving parts, of thermoplastic materials of different hardnesses. contacting a strip forming an anti-friction coating and / or an aspect film held in position during the injection, for example by external suction to the wall of the mold, so as to be plated in contact with the injected material for continuously covering the longitudinal sealing face and / or the visible longitudinal face of the profile and its slices.

This known maintenance of the band in the mold by suction against the wall of the mold on the external side opposite to the injection has the following drawbacks:

- visible traces on the outer face of the strip, due to the suction required to ensure the proper maintenance of the band;

- As soon as the overmolded length of the profile exceeds a few tens of centimeters, the flocked band deforms and slides under the pressure of the injection material, resulting in lateral offsets between two suction points and aesthetic defects of the joint forming profile. sealing obtained including in particular a shift of the flocked or slippery strip exposing in visible area the thermoplastic material that it should have masked and undesirable elongation of the strip under the pressure of this material, as well as functional defects unacceptable seal (such as contact of the sliding pane or the sheet of the vehicle with the thermoplastic material, whose coefficient of friction is much too high instead of contact of the pane or sheet with this flocked or slippery strip, which may cause a reversal of the sealing lip of the seal or premature wear of the painting of the sheet vis-à-vis). An object of the present invention is to provide a profile molded by multi-injection thermoplastic materials of different hardness forming a seal or a hubcap for a motor vehicle body, the profile to overcome all of the aforementioned drawbacks and comprising at least:

an anti-friction coating intimately connected to a longitudinal sealing face of the profile and intended to ensure a sealed contact with a mobile element of the vehicle, and / or

a film of aspect intimately connected to a visible longitudinal face of the section mounted on the vehicle and intended to enhance the appearance of this visible face, which is distinct from said sealing face,

at least one of said materials being molded with a transverse thickness overmolded on said coating and / or said film ("overmoulded" meaning, by definition of an overmolding, that (these) material (s) overmolded (s) is or are injected (s) on one or the insert (s) previously arranged (s) in a mold and constituted (s) of this coating and / or of this film), this profile of the invention being obtained by a method providing in particular effective maintenance of the or each anti-friction coating strip and / or appearance film in the mold.

For this purpose, a profile according to the invention is such that at least one deficiency of said at least one overmolded material extends through said overmolded thickness substantially to said coating and / or said film being surrounded by said overmolded thickness.

It will be noted that, by definition, this multi-injection molded section according to the invention presents in a visually recognizable way a joint plane or line of separation inherent to the molding and that is understood in a known manner by multi-injection sequential injections of several materials in the same mold, ie essentially in the particular case of bi-injection, an injection of a first material in a first mold cavity successively followed by an opening of the mold, a rotation of a movable part of the mold carrying this first injected material, a closure of the mold with a second part comprising a second cavity complementary to the first, and then an injection of a second material into the second cavity.

For example, reference may be made to FR-A1-2 897 564 in the name of the Applicant for a precise description of a mold that can be used to implement a multi-injection.

Note also that "deficiency" means in the present description a lack or defect of said at least one overmoulded material (which is advantageously relatively flexible, ie of reduced hardness) over all or almost all of the thickness of this material, which overmolded thickness is thus zero or almost zero on certain areas of the coating and / or film which are each surrounded by the overmoulded material and which are distributed over the length and / or the overmolded height of this material. In other words, the or each deficit reflects the fact that the thickness overmolded on the coating and / or film has a substantially constant thickness over the length and height overmolded in contact with the coating and / or film with the exception of discrete zones or points of substantially overmolded thickness substantially, these areas may form recesses or be filled by another material more rigid, as will be explained below.

Note further that the or each point deficiency of material overmolded on the coating and / or film provides an economy for the use of this overmoulded material, thus a reduced cost for the resulting section. In addition, these deficits are not located on a visible face of the profile once mounted on the vehicle, and therefore cause no aesthetic or functional defect on the profiles incorporating them.

According to a preferred embodiment of the invention, said at least one deficit is discontinuous, being defined by a plurality of recesses which are spaced over an overmolded length and / or an overmolded height of said at least one overmolded material being formed in the latter and which have said bottom coating and / or said film.

Advantageously according to this preferred embodiment, said recesses follow one another regularly or not according to intervals which may be equal to or greater than 3 mm (for example between 5 mm and 100 mm), aligned with said overmolded length or staggered further over said overmolded height, said recesses each having a larger transverse dimension in cross-section; may be between 1 mm and 10 mm and each having a section for example substantially polygonal (eg rectangular or square) or cylindrical (eg of elliptical, oblong or circular section) whose area decreases towards said coating or said film to reach a minimum value in contact with said coating or said film.

According to another embodiment of the invention, said at least one deficit is continuous, being defined by an oblong recess.

According to another preferred feature of the invention, said profile may advantageously form a seal selected from the group consisting of internal or external louvers for mobile glazing of a vehicle or a hubcap for a double seal on a body, the profile comprising:

a fastening portion which comprises at least one rigid material, which has said visible face and comprises an inner and an outer limb connected to one another and intended to be mounted on a carrier of the vehicle and which further comprises on said outer limb a partially coating said at least one rigid material made of at least one flexible material, and

a sealing portion of said at least one flexible material which is connected to the fixing portion and which has said sealing face,

this joint forming profile comprising:

in said sealing portion, said floc-type coating covering said at least one overmolded material which exhibits said at least one deficit and which consists of said at least one flexible material, and / or

in said fixing portion, said film (eg glossy black or chromed, this film possibly consisting of any material, for example metallic or metallized) covering said at least one overmolded material which has said at least one deficiency and which is constituted of said at least one flexible material or said at least one rigid material.

According to a first embodiment of the invention for this joint profile, said at least one overmolded flexible material has in said sealing portion said at least one deficit which is defined by at least one empty recess in the form of a hole (s). ) blind (s) extending through said overmolded transverse thickness to said coating.

According to this first example, said at least one deficit may be defined in said sealing portion by a plurality of said empty recesses forming a linear or staggered spaced succession of said blind holes, which may each have a section, for example substantially polygonal or cylindrical whose area decreases towards said coating to reach a minimum value at the bottom of each hole which is preferably rounded concavely.

According to a second embodiment of the invention for this seal profile which may advantageously be added to said first example for the sealing portion, said at least one overmoulded material has in said fixing portion said at least one deficiency which is present in said at least one flexible material and which is defined by at least one recess filled with at least one protrusion of said at least one rigid material and extending through said overmolded transverse thickness of said flexible material (s) ( s) until this movie.

According to this second example, said at least one deficit can be defined in said fixing portion by a plurality of said filled recesses forming a linear or staggered spaced succession of said projections, which may each have a section, for example substantially polygonal or cylindrical, of which the area decreases towards said film to reach a minimum value in contact with said film.

According to a third embodiment of the invention for this section forming a seal or hubcap which may advantageously be added to said first example for the sealing portion, said at least one overmoulded material has in said fixing portion said at least one deficit who is present in said at least one rigid material and which is defined by at least one recess filled by said at least one flexible material and extending through said overmolded transverse thickness of said rigid material (s) to audit film.

According to this third example, said at least one rigid material may have in said fixing portion several series of said deficits which each have a decreasing area section towards said film to reach a minimum value in contact with said film, and which are respectively formed by said filled recesses spaced linearly or staggered, these series may comprise a first series of said recesses in a zone for example end of said outer branch and a second series of said recesses substantially in a zone connecting said inner branch to this external branch.

According to another characteristic of the invention common to all of the aforementioned embodiments and embodiments, said at least one flexible material may be based on a flexible thermoplastic elastomer (TPE). As to said at least one rigid material, it may be based on at least one non-elastomeric thermoplastic polymer (TP) that can be used to form the portion for attaching a seal or hubcap to a motor vehicle and having a density lower than 1, 1 (excluding charges).

Advantageously, this thermoplastic polymer (s) may be selected from the group consisting of polypropylenes, polyamides, polyvinyl chlorides (PVC), polymethyl methacrylates (PMMA), terpolymers acrylonitrile-butadiene-styrene (ABS) and mixtures thereof, and is preferably a polypropylene reinforced with a filler for example selected from the group consisting of talc, hemp, wood, cork, glass fibers and mixtures thereof ( the function of this load being to increase the rigidity of the base material). It will be noted that other thermoplastic polymers are usable, and that the choice of these polymers in particular meets a compromise between the cost and the rigidity of the materials in question. Also advantageously, said at least one flexible TPE has a hardness or rigidity lower than that of (these) material (s) rigid (s) and has a density less than 1, 1 (excluding charges). It may for example be a styrenic thermoplastic elastomer (TPS, eg an SEBS) or a thermoplastic vulcanizate (TPV, eg "Santoprene" or "Vegaprene").

As anti-friction coating (s) used in the seals of the invention, one can for example mention multilayer flocked strips such as those sold by Dimontonate Floccati and described in EP-B1 - 2 121 303, ie comprising at least one heat-adhesive layer for example based on an ethylene-propylene copolymer, a first adhesive layer for example based on a grafted polypropylene, a thermoplastic polycondensation polymer layer, a second layer adhesive for example based on a polyurethane and a flock, for example based on a polyester or polyamide. It will be appreciated, however, that antifriction coatings other than flocked webs are useful in the present invention, such as, for example, high density polyethylene (HDPE) or crosslinked polyethylene (PER) or other slippery plastic in the form of a web.

Note that a profile according to the invention may simultaneously incorporate one or more coating (s) antifriction and / or one or more film (s) of appearance, by the joint implementation in the muti-injection mold of the or each sealing strip and / or the or each appearance strip.

A manufacturing method according to the invention of a profile as defined above comprises a multi-injection overmoulding, in a single rotary-type multi-injection mold with fixed and movable parts, of said thermoplastic materials with different hardnesses. contacting said antifriction coating and / or said appearance film, all or part of said coating and / or said film being held in position during overmolding of said at least one overmolded material by a pressure adjacent to a wall of said mold. According to the invention, this method is such that said pressure is obtained by a localized mechanical contact passing through said mold said at least one overmolded material and directly plating said coating and / or said film against said wall.

According to said preferred embodiment of the invention characterized by said plurality of recesses in said at least one overmoulded material, this mechanical contact is advantageously applied discontinuously according to areas of contact with said coating and / or said film which are spaced apart from each other. in a regular manner or not at intervals that may be equal to or greater than 3 mm (for example between 5 mm and 100 mm), aligned with said overmolded length or staggered further on said overmolded height, said contact zones having in section a larger transverse dimension can be between 1 mm and 10 mm.

According to said preferred characteristic of the invention referring to the manufacture of a seal as a profile in particular according to the first, second and third examples mentioned above, this method comprises sequential injections in indentations distinct from said mold of at least a rigid material in at least a first impression then said at least one flexible material in at least a second impression, the injection of this flexible material being performed after opening, rotation of a movable part of the mold containing the rigid material injected then closing of the mold, and said mechanical contact is applied against said coating and / or said film before and during the injection of said at least one rigid material and / or said at least one flexible material.

Preferably, said method further comprises, during overmolding of said at least one overmoulded material, a positional holding of said coating and / or of said film by an auxiliary technique chosen from the group constituted by an external suction of said coating and / or said film , electromagnetic techniques and by bonding to said wall.

Advantageously, it is chosen as auxiliary technique e maintenance suction of the band (s) intended (s) to form said coating and / or said film during injection, via a plurality of suction channels formed through said mold and opening respectively to said sealing face and / or said visible face outside said wall, for maintain the or each band in position in the mold. In the case of an auxiliary support by suction, to avoid traces of circles marked on the coating and / or film at these suction channels, it is advantageous to insert a microporous material between the mold wall and this coating and / or film.

A rotary multi-injection mold according to the invention for the implementation of the manufacturing process of the aforementioned section comprises at least one fixed part, a movable part and means for holding a wall of the mold against a wall of a coating and or a film positioned on said wall during the injection of at least one over-molding material in contact with said coating and / or said film to an overmolded thickness of said at least one overmolded material.

According to the invention, this mold is such that said holding means are formed at least partly inside said wall in said fixed part and / or in said movable part and are adapted to protrude through said overmolded thickness substantially up to said coating and / or film being surrounded by this thickness, so as to exert an internal pressure localized on said wall.

According to another characteristic of the invention, said projecting holding means may comprise several series of salient elements such as fingers, studs, pins and / or ribs which for each series are spaced regularly or otherwise at intervals which may be equal or greater than 3 mm (for example between 5 mm and 100 mm), in line with an overmolded length or staggered further over an overmolded height, each having a larger transverse dimension in cross section which may be between 1 mm and 10 mm. These elements can be machined directly on a mold plate or mechanically reported in the mold (for example by screwing or insertion with a zero clearance), and they are respectively adapted to form a plurality of recesses spaced apart in said at least one molded material and having said coating and / or said film as a bottom.

Advantageously, said protruding elements may each have a section, for example substantially polygonal (eg rectangular or square) or cylindrical (eg of elliptical, oblong or circular section) conferring on them a geometry profiled substantially truncated pyramid or cone whose area decreases in the direction of said wall and which ends with a small base or rounded end of convex shape, ie devoid of sharp edge.

It will be noted that this convex end of the projecting elements according to the invention makes it possible not to degrade the film or coating strip which it maintains, and that the shape and dimensions of these elements are generally designed not to generate weakening of the performance of the portion or sealing lip against which these protruding elements support.

It will also be noted that this profiled geometry of the projecting elements allows easier demolding of the profile obtained outside the mold.

As indicated above in relation to the recesses of the overmoulded flexible material generated by these protruding elements according to the invention, the arrangement of these elements can be linear rectilinear or staggered, for example, the choice of a rectilinear alignment of these elements. elements that can create a voluntary linear weakness on the body of the lip or sealing portion, in order to adapt in some cases its pressure on the window or on the vehicle sheet. It may be noted that a staggered distribution of the protruding elements, therefore the recesses (empty or filled) of the overmolded flexible material provides, in particular, the advantage of better distributing the pressure on the film and / or coating, thus holding it against said wall of the mold. .

As also explained above in relation to these empty or filled recesses, the largest transverse dimension of the protruding elements (ie their diameter if they are cylindrical) can for example vary from 1 mm to 4 mm, an optimum value being from 2 mm to 3 mm for both robustness and mechanical realization. However, it may be advantageous to use in the same mold according to the invention protruding elements of different dimensions and / or shapes.

Thus, the gap between the projecting elements can be regular or variable and is generally adapted to the specific geometry constraints of the profile and the environment. For example, at the ends of the lips of a liner forming section, when these lips are in close contact with vertical strands of a window slide joint, projecting elements less spaced allow to accentuate the flexibility of the lip and to avoid too much pressure on the glass or an increase in this pressure. Similarly, for producing a profile of non-rectilinear geometry, a smaller spacing of the projecting elements in the areas where said coating or film follows a radius of curvature, may allow a better maintenance of this coating or film.

The spacing between the projecting elements may be equal to or greater than 3 mm to be effective, and it varies for example between 5 mm and 100 mm, it being specified that the choice of the number of these elements on the lip length has an impact. direct on the price of the mold. In the case of a rectilinear linear profile without particular constraint, regular intervals of about 20 mm between two consecutive protruding elements make it possible to obtain a good ratio between the mold price (taking into account the addition or the machining of the projecting elements), the amount of over-molded material saved to the right of these elements for the portion or sealing lip, in particular, and the effective maintenance of the coating or film in the mold.

It should be noted that one of the major advantages of a profile thus manufactured according to the invention is that it is produced by a single tooling station consisting of this mold, which is used according to several sequences comprising, for the manufacture of a seal, the injection of a rigid material, the positioning in the mold of at least one coating and / or film, then the injection of the flexible material molded onto this coating and / or film in a reliable way as to the maintenance of the coating and / or film. In the case of a floc-type coating thus overmolded to form a seal, the projecting elements now by localized pressure coating against the inner face of said mold wall can cause slight markings resulting from a crushing of the flock to the right of these elements, markings which disappear nevertheless in the normal conditions of operation and which do not cause any fall of the performances.

Other characteristics, advantages and details of the present invention will emerge on reading the following description of several examples of embodiment of the invention, given for illustrative and not limiting, said description being made with reference to the accompanying drawings, among which :

FIG. 1 is a side view of a motor vehicle illustrating examples of zones of this vehicle that can be equipped with profiles according to the invention, forming seals or hubcaps, FIG. 2 is a diagrammatic cross-sectional view. a bi-injection mold containing a seal according to the first example of the invention forming a liner provided with an anti-friction coating by overmolding, the kinematics of different parts of this mold being illustrated by arrows,

FIG. 3 is a perspective side view of a seal according to the invention mounted on a rabbet of a frame and having aligned deficits of overmoulded material, such as that visible in FIG. 2, FIG. a schematic perspective view of a portion of a mold according to the invention provided with a series of aligned pins for obtaining a seal according to the invention of the type of that of FIGS. 2 and 3,

FIG. 5 is a partial diagrammatic view in longitudinal section of a known bi-injection mold that can be used to obtain a sealing portion of a seal according to the prior art, before overmoulding of a flexible material on an anti-friction coating placed in the mold, FIG. 6 is a partial schematic view in longitudinal section of the known mold of FIG. 5, after overmoulding of the flexible material on this coating,

FIG. 7 is a partial schematic view in longitudinal section along plane VII-VII of FIG. 2 of a bi-injection mold with aligned pins according to an example of the invention that can be used to obtain a sealing portion of the seal of FIGS. FIGS. 2 and 3, before overmoulding a flexible material on an anti-friction coating placed in the mold,

FIG. 8 is a partial schematic view in longitudinal section of the mold of FIG. 7, the pins of which have formed the aligned deficits according to the invention of the flexible material molded onto this coating, FIG. 9 is a partial schematic view in longitudinal section of FIG. a bi-injection mold pinned staggered according to a variant of the invention used to obtain a sealing portion of a seal according to the invention such as that of Figure 1 1, before overmoulding of a flexible material on an anti-friction coating placed in the mold,

FIG. 10 is a partial diagrammatic view in longitudinal section of the mold of FIG. 9, the pins of which have formed the staggered deficits according to the invention of the flexible material molded onto this coating, FIG. 11 is a perspective side view of FIG. a seal according to the invention mounted on a rabbet of a frame and having these staggered deficits, such as that obtained in FIG. 10,

FIG. 12 is a photograph of the sealing portion of a liner seal according to the invention, having a rectilinear alignment of mutually very close deficits,

FIG. 13 is a photograph of the sealing portion of another liner seal according to the invention, having a rectilinear alignment of mutually farther deficits,

FIG. 14 is a diagrammatic cross-sectional view of a bi-injection mold in a first phase of manufacture of a liner seal according to the second example of the invention; corresponding to a variant of FIG. 2, the kinematics of different parts of this mold being illustrated by arrows,

FIG. 15 is a schematic cross-sectional view of the bi-injection mold of FIG. 14 in a second phase of manufacture of this seal according to this second example of the invention, FIG. 16 is a diagrammatic view in section. transverse bi-injection mold of Figures 14 and 15 in a third phase of manufacture of this seal according to this second example,

Fig. 17 is a schematic cross-sectional view of a seal according to the third example of the invention according to a variant of Fig. 16, and

FIG. 18 is a diagrammatic cross-sectional view of an embellisher for a double seal on a body according to the third example of the invention according to a variant of FIG. 17.

In the following, the terms "axially internal" and "axially external" will be used in the usual manner to designate the position of a profile element inwardly and outwardly, respectively, in the axial direction Y of the the width of the vehicle (this transverse horizontal direction Y being by definition perpendicular to the plane XZ defined by the longitudinal horizontal X and vertical Z directions, see FIG. 1),

As illustrated in Figure 1, a profile according to the invention can form a hubcap or a seal in various locations 1, 2, 3 and / or 4 of the body of a motor vehicle, for example in the case of a seal for ensuring, via an anti-friction coating, a sealed contact between a support of the bodywork and another element of the vehicle such as a fixed or movable glazing. Zones 1 and 2 each show a profile constituting an inner or outer liner ensuring the seal between a door panel 1a, 2a and sliding glazing 1b, 2b, zone 3 shows a vertical bottom seal called "jet d "water" at the rear edge of the front side door 1a, the zone 4 shows a seal sealing between the front edge of the front side door 1a and the adjacent wing 5 of the vehicle, the joints 6 and 7 respectively show so-called "between-frames" and "upper flush" joints between the frame of the adjacent door and the body side, and zones 8 and 9 show slide joints. Note however that a profile according to the invention could be used in other locations than those illustrated in Figure 1.

FIGS. 2 to 4 illustrate an example of manufacture according to the invention of a seal 10, for example forming a glazing liner, via a bi-injection overmolding in a mold 20 comprising a fixed part 21 at its bottom. and a movable sector portion 22, 23, 24, 25 (whose respective opening movements relative to the fixed portion 21 are identified by arrows). As can be seen in FIGS. 2 and 3, the seal 10 comprises a fastening portion 1 1 on a bodywork support which has a rigid core forming a clamp 1 1a, 1 1b intended to be clamped on this support, and a flexible portion of sealing 12 between this support and the movable glazing 1b, 2b which is connected to the fixing portion 1 1 in the manner of a hinge and which is constituted in this example of a sealing lip substantially forming a "V" in cross section with the adjacent branch 1 1a internal rigid core 1 1a, 1 1b. The seal 10 incorporates an anti-friction coating 13 which has been over-molded and intimately covers the longitudinal sealing face 12a of the back of the sealing lip 12 and advantageously the two end sealing strips (i.e. in the transverse direction Y).

As illustrated in FIG. 2, the coating 13 of the seal 10 is deposited on a flexible material M1 constituting the sealing lip 12 and inner and outer casings 11c and 11d of the outer rigid branch 11b of the clip 1 1 a, 1 1 b (it being specified that the lip 12 and the coatings 1 1 c, 1 1 d can be made of two or three different flexible materials in the case of a multi-injection). The coating 13 covers the sealing lip 12 over most of its oblique profile ending just below the curved end of this lip 12.

We begin by injecting in a known manner the rigid material M2 (eg based on a thermoplastic polymer) forming the clamp 1 a, 1 1b in the mold 20, then the coating strip 13 is placed on a wall 21a of the fixed part 21 of the mold 20 by an operator or an automaton. The flexible material M1 (eg based on a thermoplastic elastomer) is then injected forming the sealing lip 12 and the coatings 1c, 1 1d with the result visible in FIG. 2 that this injected flexible material M1 is overmoulding the This overmolding conventionally carried out and illustrated in FIGS. 5 and 6 in a known mold M, provides a continuous contact between the molded flexible material M1 and the coating 13, it being specified that the suction channels 26 are usually provided for. the outside of the wall 21 has to maintain the strip 13 against it during overmolding.

According to the invention and as visible in FIGS. 4, 7-8 and 9-10, the mold 20, 20 'incorporates a plurality of spaced-apart, preferably spike-like protruding elements 27, 27' (machined directly on a plate 28 of the mold 20, see Figure 4, or alternatively reported for example by screwing), which come to clad in a localized manner the coating 13 against the wall 21a of the fixed portion 21 of the mold 20, 20 'after injection of the rigid material M2 and before injection of the flexible material M1, and which during this injection of the flexible material M1 remain applied locally against the coating 13 so as to form at the exact location of these pins 27, 27 'deficits 14, 14' of material M1 in the form of recesses 14, 14 'spaced in the same manner as the pins 27, 27' having generated them. We see in the example of Figure 2 that these pins 27, 27 'have a substantially frustoconical geometry of decreasing section towards the coating 13, which facilitates the release of the seal 10, 10', to a rounded end of convex manner of each pin 27, 27 'which makes it possible not to degrade the coating 13.

Note that the band 13 can be held in place by suction (ie vacuum), electromagnetism or by an adhesive, for example. In the case of their holding by suction, it is possible to use channels 26 arranged in the mold 20, by optionally interposing a lamella of protection in a microporous material to avoid marking the band 13 by the edge opening of each suction channel 26.

FIG. 3, which shows the result of an overmoulding performed with the aligned pins visible in FIGS. 7 and 8, showing the fixed portion 21 and the movable portion 26 of the mold 20, that the sealing portion 12 obtained for the demolded seal 10 may thus comprise a rectilinear alignment of such recesses 14 which are empty molded flexible material M1 (their volume having been occupied by the pins 27 of the mold 20 during overmoulding) and which succeed each other in this example at irregular intervals, which can in particular make it possible to adapt the flexibility or, on the contrary, the pressure of the lip 12 on the glazing 1a, 1b, once the seal 10 is mounted on the rabbet A of the frame by its fixing portion 11.

FIGS. 12 and 13 show examples of alignments of the recesses 14 of circular or oblong cross-section, for example, which are formed at more or less close intervals on the internal face of the sealing lip 12 of the gasket 10.

FIG. 11, which shows the result of an overmoulding performed with the staggered pins visible in FIGS. 9 and 10, showing the fixed part 21 and the movable part 26 'of the mold 20', that the sealing portion 12 'obtained for the demolded joint 10' can thus comprise a staggered arrangement of recesses 14 'empty of flexible material M1 molded (their volume having been occupied by the pins 27' of the mold 20 'during overmolding), which can in particular allow to better distribute the pressure on the band 13 and its maintenance in the mold 20 '.

The liner seal 10 "made according to the variant of FIGS. 14-16 essentially differs from the seal 10 of FIG. 2 in that it has, in addition to the antifriction coating 13 on the sealing face of its sealing portion. 12 which is coated with the molded flexible material M1 via the pins 27 or 27 'above generating the recesses 14 above, a sliding film 15 (eg glossy black or chrome) on the visible face of its fixing portion 11 which is obtained as follows . As can be seen in FIG. 14, in a first step inside the mold 20 "the rigid material M2 forming the clamp 11" is injected, which clamp is characterized in that its rigid branch 11b is intended to be coated. of the flexible coating 1 1 d has rigid protuberances 1 1 e type studs, pins or continuous ribs (advantageously coupled to one or more lines of style). These rigid protuberances 1 1 e are designed to perform the same function of retaining the film 15 in the mold 20 "than the elements 27, 27 'above and inherent to the mold 20, 20'.

As can be seen in FIG. 15, positioning in a second step the strips respectively forming the coating 13 and the film 15 against respective walls 21a and 23a of the mold 20 ", so that the projecting elements 27 of the mold 20" and the rigid protuberances 1 1e support localized respectively on the coating 13 and on the film 15.

And as shown in FIG. 16, the flexible molding material M1 is injected into the spaces of the mold 20 "provided for this purpose, so that the material M1 covers the coating 13 by surrounding the projecting elements 27 and covers the film 15. These protuberances 1e in contact with the film 15 thus form recesses 14 "in the molded flexible material M1 which, like the recesses 14 and 14 'mentioned above, are empty of flexible material M1 but are filled by the rigid material M2 unlike the empty recesses 14 and 14 '. These protuberances 1 1e and recesses 14 "may be formed on one or more longitudinal line (s) of the fixing portion 11" (as illustrated on the two lines shown in Figure 16), for example staggered.

In the third example of the invention illustrated in FIG. 17, the seal 10 "'obtained is essentially different from the seal 10" of FIG. 16 in that the overmolded material has in the fixing portion 1''' two sets of deficits 14-i "'and 14 ₂ '" in the rigid material M2 that is first injected into the mold so that the material M2 overmould overturn the film of appearance 15 ', these deficits forming recesses 14' and 14 ₂ '"which are filled by the flexible material M1 injected later. As for the sealing portion 12 of the seal 10 "', it is similar to that of Figures 2 and 16. More specifically, the first series is formed in an end zone of the outer branch 1 1b by spaced recesses 14 _! "'In the rigid M2 and the second series material is simultaneously formed in a connecting zone between the inner branches 1 1a and external 1 1 b by five recesses spaces 14 _2'" in this material M2 (in a linear arrangement or quincunx independent of that of the first series).

For this purpose, a first and a second series of pins or pins are used in a first cavity of the mold, which are respectively designed to form the recesses 14 'and 14 ₂ "' in the material M2 and which, when injection of this material, maintain the film 15 'against the corresponding wall of the mold by a localized support in the first cavity of the mold, then is used in a second cavity of the mold during the next step of bi-injection another series of pins or pins which are designed to form the recesses 14 in the material M1 15 to fill these recesses 14i '' and 14 ₂ '"and which also maintain the coating 13 against the corresponding wall of the mold.

As illustrated in FIG. 17, these recesses 14 1 "'and 14 _2' 'which extend through the overmolded thickness of the material M2 to the film 15' and are then filled with the material M 1, each

Decreasing area section towards the film 15 '.

In the variant of the third example of the invention illustrated in FIG. 18, the profile 10 "" obtained is essentially different from the profile 10 "'of FIG. 17, in that this profile 10" "forms a hubcap for a double seal. therefore, the trim 10 "" comprises:

An attachment portion 11 "'intended to be mounted on a door frame by projecting fastening elements 16 and 17 and for example intended in addition to hold in place on this frame a sliding joint (not visible) via at least one holding member 18, the portion 1 1 "" having an outer branch 1 1 b 'generally vertical and an inner leg 1 1a'

Extending horizontally at right angles to the inside of the vehicle from the outer limb 1 1 b ', and - A sealing portion 12 similar to that of Figure 17 but which extends from the free end of the inner limb 1 1a '.

Like Figure 17, it is seen that the section 10 "" of Figure 18 has the attachment portion 1 1 "" Two sets of gaps 14 "and 14 _2" "in the rigid material M2 that one injects first into the mold for this material 2 to overmold the film of appearance 15 ", these deficits forming two series 14i""and 14 ₂ ""of spaced recesses which are filled by the flexible material 1 injected later (l a 14-i "" to the lower free end of the outer branch 1 1b ', and the other 14 ₂ "" just above the connection between the two arms 1 1 a' and 11 b ') and which are obtained in the aforementioned manner in relation with FIG. 16. As for the sealing portion 12, it is similar to that of FIG. 17 with blind recesses 14 formed in the flexible material 1.

Alternatively, if the film of appearance 15 ', 15 "to be maintained must cover a rigid thermoplastic material M2 (from the first injection step), it will be noted that protruding elements may be provided passing through this rigid material M2, but in areas preferentially masked by the injection of the flexible material M1 during the second step, so as not to reveal appearance defects on the film 15 ', 15 ".

In general, it will be noted that the anti-friction and / or aspect strips respectively intended to form the coating 13 and / or the film 15 are either of fixed width and unwound from a coil, or of complex shapes and, in In this case, they can be cut from a reel and then thermoformed, or cut from a flat sheet to the punch. These strips may also consist of a sheet protruding from the mold 20, which is cut after molding to adjust it to the finished product.

Note also that the fixing portion of a seal according to the invention may be, as a variant of what has been described above, adapted to be mounted by clipping on the support via a plurality of pins or clips that pass through spaced this fixing portion and which are intended to pass through an orifice of this support. According to another variant, the portion of fixation may end with a leg provided with spikes in the manner of a harpoon end, for its attachment in a U-section portion of the support.

Claims

1) Multi-injection molded profile (10, 10 ', 10 ", 10"', 10 "") of thermoplastic materials (M1 and M2) of different hardness forming a seal (10, 10 ', 10 ") , 10 "') or a hubcap (10" ") for a motor vehicle body (1 a, 2a), the profile comprising at least:

an anti-friction coating (13) intimately connected to a longitudinal sealing face (12, 12 ') of the profile and intended to ensure a sealed contact with a mobile element (1, 2b) of the vehicle, and / or

an aspect film (15, 15 ', 15 ") intimately connected to a visible longitudinal face (1 1, 1 1") of the profile mounted on the vehicle and intended to enhance the appearance of this visible face, which is distinct from said sealing face,

at least one of said materials (M1, M2) being overmoulded with a transverse thickness overmolded on said coating and / or said film, characterized in that at least one deficit (14, 14 ', 14 ", 14-T' , 14 ₂ '", 14-T"', 14 ₂ "") of said at least one overmoulded material (M1, M2) extends through said over-molded thickness substantially to said coating and / or said film being surrounded by said overmolded thickness.

2) Profile (10, 10 ', 10 ", 10"', 10 "") according to claim 1, characterized in that said at least one deficit (14, 14 ', 14 ", Mi'", 14 ₂ '",14", 14 ₂ "") is discontinuous, being defined by a plurality of recesses (14, 14 ', 14 ", 14ι"', 14 ₂ '', 14 "" 14 ₂ "") which are spaced over an overmolded length and / or an overmolded height of said at least one molded material (M1, M2) being formed therein and which have said bottom (13) and / or said film (15, 15 ', 15 ").

3) Profile (10, 10 ', 10 ", 10"', 10 "") according to claim 2, characterized in that said recesses (14, 14 ', 14 ", 14"", 14 ₂ '", 14 ",

14 ₂ "") follow one another regularly or not at equal or intervals greater than 3 mm, in alignment on said overmolded length or staggered further on said overmolded height, said recesses each having in cross section a greater transverse dimension of between 1 mm and 10 mm and each having a section whose area decreases towards said coating (13) or said film (15). , 15 ', 15 ") to reach a minimum value in contact with said coating or film.

4) Profile (10, 10 ', 10 ", 10"', 10 "") according to one of the preceding claims, characterized in that it forms said seal (10, 10 ', 10 ", 10"' ) selected from the group consisting of internal or external louvers for mobile glazing (1b, 2b) of a vehicle or a hubcap (10 "") for a double seal on a body, the profile comprising:

a fixing portion (1 1, 1 1 ", 1 1 '", 1 1 "") which comprises at least one rigid material (M2), which has said visible face and comprises an inner limb (1 1 a, 1 1 a ') and an outer leg (1 1 b, 11 b') interconnected and intended to be mounted on a carrier (A) of the vehicle and which further comprises on said outer branch a partial coating (1 1d, 1 1d ', 1 1 d ") of said at least one rigid material made of at least one flexible material (M1), and

a sealing portion (12, 12 ') of said at least one flexible material (1) which is connected to the fixing portion and which has said sealing face,

the profile comprising:

in said sealing portion, said floc-coating (13) covering said at least one overmoulded material which exhibits said at least one deficit (14, 14 ') and which consists of said at least one flexible material (M1), and or

- in said fixing portion, said film (15, 15 _'!, 15 ") covering said at least one molded material having said at least one gap (14", 14 "', 14 ₂ '', 14i '," 14 ₂ "") and which is constituted of said at least one flexible material (M1) or said at least one rigid material (M2), 5) Profile (10, 10 ', 10 ", 10"', 10 "") according to claim 4, characterized in that said at least one overmolded flexible material (M1) has in said sealing portion (12, 12 said at least one deficit (14, 14 ') which is defined by at least one empty recess (14, 14') in the form of a blind hole (s) extending through said overmolded transverse thickness; coating (3).

6) Profile (10, 10 ', 10 ", 10"', 10 "") according to claim 5, characterized in that said at least one deficit (14, 14 ') is defined in said sealing portion (12 , 12 ') by a plurality of said empty recesses (14, 14') forming a linear spaced succession (14) or staggered (14 ') of said blind holes, which each have a section whose area decreases towards said coating ( 13) to reach a minimum value at the bottom of each hole which is preferably rounded concavely.

7) Profile (10 ") according to one of claims 4 to 6, characterized in that said at least one overmolded material has in said fixing portion (1 1") said at least one deficit (14 ") which is present in said at least one flexible material (M1) and which is defined by at least one filled recess (14 ") by at least one protrusion (1 1 e) of said at least one rigid material (M2) and extending through said transverse thickness overmolded of this (s) soft material (s) (M1) until said film (15).

8) Profile (10 ") according to claim 7, characterized in that said at least one deficit (14") is defined in said fixing portion (1 1 ") by a plurality of said filled recesses (14") forming a succession spaced linear or staggered said projections (1 1e), which each have a section whose area decreases towards said film (15) to achieve a minimum value in contact with said film.

9) Profile (10 "', 10"") according to one of claims 4 to 6, characterized in that said at least one overmolded material present in said fixing portion (1 1 "') said at least one deficiency (14ι"', 14 ₂ '"or 14i"", 14 ₂ "") which is present in said at least one rigid material (M2) and which is defined by at least one filled recess (14 ', 14 ₂ '"or14i"", 14 ₂ "") by said at least one flexible material (M) and extending through said overmolded transverse thickness thereof Rigid material (s) (M2) to this film (15 ', 15 ").

10) Profile (10 "', 10"") according to claim 9, characterized in that said at least one rigid material (M2) has in said fixing portion (1'") several series of said deficits (14- ι "'and 14 ₂ '", 14 "and 14 ₂ "") which each have a decreasing area section towards said film (15 ', 15") to achieve a minimum value in contact with said film, and which are respectively formed by said filled recesses (14 ', 14 ₂ '"or14", 14 ₂ "") spaced linearly or staggered, these series comprising a first series of said recesses (14ι "'or 14-i"") in a zone for example end of said outer branch (1 1 b, 1 1 b ') and a second series of said recesses (14 ₂ "' or 14 ₂ "") substantially in a zone connecting said inner limb (1 1 a, 1 1 a ') to this external branch. 1 1) Profile (10, 10 ', 10 ", 10"', 10 "") according to one of claims 4 to 10, characterized in that said at least one flexible material (M1) is based on a thermoplastic elastomer flexible and in that said at least one rigid material (M2) is based on at least one non-elastomeric thermoplastic polymer.

12) A method of manufacturing a profile (10, 10 ', 10 ", 10"', 10 "") according to one of the preceding claims, characterized in that it comprises a multi-injection overmoulding, in a single mold (20, 20 ', 20 ") rotary type multi-injection with fixed (21) and movable (22, 23, 24, 25, 26, 26') parts, of said thermoplastic materials (M1 and M2) of different hardnesses in contact with said antifriction coating (13) and / or said aspect film (15, 15 ', 15 "), all or part of said coating and / or said film being held in position during overmoulding of said at least one overmolded material (M1, M2) by a pressure adjacent to a wall (21a, 23a) of said mold, characterized in that said pressure is obtained by a localized mechanical contact through inside said mold said at least one overmolded material (M1, M2) and directly plating said coating and / or said film against said wall. 3) Process according to claim 12, characterized in that said mechanical contact is applied discontinuously in areas of contact with said coating (13) and / or said film (5, 15 ', 15 ") which are spaced apart regular or otherwise at intervals equal to or greater than 3 mm, aligned with an overmolded length or staggered further over an overmolded height, said contact areas having in cross section a greater transverse dimension of between 1 mm and 10 mm .

14) A method according to claim 12 or 13 for the manufacture of an inner or outer liner type seal (10, 10 ', 10 ", 10"') for mobile glazing of a vehicle or a trim (10 "") for double seal on box as a profile (10, 10 ', 10 ", 10"',

10 ""), this profile comprising:

- a fixing portion (11, 1 1 ", 1 1" ', 1 1 "") which comprises at least one rigid material (M2), which has said visible face and comprises an inner branch (1 1 a, 1 1a ') and an outer leg (1 1b, 11b') connected to each other and intended to be mounted on a carrier (A) of the vehicle, and which further comprises on said outer branch a partial coating (1 1 d, 1 1d \ 1 1 d ") of said at least one rigid material made of at least one flexible material (M1), and

a sealing portion (12, 12 ') of said at least one flexible material (M1) which is connected to the fixing portion and which has said sealing face,

the profile comprising: in said sealing portion, said floc-coating (13) covering said at least one overmoulded material which exhibits said at least one deficit (14, 14 ') and which consists of said at least one flexible material (M1), and or

In said fixing portion, said film (15, 15 ', 15 ") covering said at least one overmolded material (M1, M2) which exhibits said at least one deficit (14", 14, 14 ₂ '", 14 ", 14 ₂ "") and which is constituted of said at least one flexible material (M1) or said at least one rigid material (M2), characterized in that the method comprises sequential injections in indentations distinct from said mold ( 20, 20 ', 20 ") of said at least one rigid material (M2) in at least one first impression then said at least one flexible material (M1) in at least one second impression, the injection of this flexible material being carried out after opening, rotation of a moving part (26, 26 ') of the mold containing the rigid material

Injected then closing the mold, and in that said mechanical contact is applied against said coating and / or said film before and during the injection of said at least one rigid material (M2) and / or said at least one flexible material ( M1).

15) A method according to one of claims 12 to 14, characterized in that it further comprises, during overmolding of said at least one overmolded material (M1, M2), holding in position said coating (13) and / or said film (15, 15 ', 15 ") by an auxiliary technique selected from the group consisting of an external suction of said coating and / or said

Film, electromagnetic techniques and by bonding to said wall (21a, 23a).

16) Rotary multi-injection mold (20, 20 ', 20 ") for carrying out a method of manufacturing a profile (10, 10', 10", 10 "', 10"") according to one of claims 12 to 15, the mold comprising at least one fixed part (21), a movable part (22, 23, 24, 25, 26, 26 ') and means for holding in position (26, 27, 27 ', 11e) against a wall (21a, 23a) of the mold a coating (13) and / or a film (15, 15 ', 15 ") positioned on said wall during the injection of at least one overmoulding material (M1, M2) in contact with said coating and / or said film on an overmolded thickness of said at least one molded material (M1, M2), characterized in that said holding means (27, 27 ', 1 1e) are formed at least partly inside of said wall in said fixed portion and / or in said movable portion (26, 26 ') and are adapted to protrude through said overmoulded thickness substantially to said coating and / or film being surrounded by said thickness, so exerting an internal pressure localized on said wall.

17) mold (20, 20 ', 20 ") according to claim 16, characterized in that said projecting holding means (27, 27', 1 1e) comprise several series of projecting elements (27, 27 ', 1 1e) of the type fingers, pads, pins and / or ribs which for each series are regularly spaced or not at intervals equal to or greater than 3 mm, aligned with an overmolded length or staggered further over an overmolded height, each having in section a greater transverse dimension of between 1 mm and 10 mm, said projecting elements being machined directly on a plate (28) of the mold or mechanically reported in the mold and being respectively adapted to form a plurality of recesses (14, 14 ', 14 ", 14Γ, 14 _2'", 14 ", 14 _2" ") spaced in said at least one overmold material (M1, M2) and having the bottom said coating (13) and / or said film (15, 15 ', 15 ") 18) Mold (20, 20', 20") according to the resold 17, characterized in that said projecting elements (27, 27 ', 1 1 e) each have a substantially polygonal or cylindrical section conferring on them a substantially truncated pyramid or cone geometry whose area decreases in the direction of said wall (21 a, 23a) and which ends with a small base preferably convex.