FR2580983A1 - Two-coloured or multi-coloured containers produced from two or more plastics of different colours, especially by dual- or multi-injection moulding, and having decorative designs or the like made in one or more colours, and process for obtaining them - Google Patents

Abstract

Container produced especially by injection moulding from at least two suitable plastics of different colours. This container comprises a composite wall constituted by the juxtaposition of an inner wall 3 and an outer wall 4, each produced from a plastic of different colour, the colour of the outer wall of which corresponds to the background colour from which emerge the decorative designs 5 or the like which, moulded as one piece with the inner wall of the container 1 produced in another colour, project outwards from this inner wall, which material defining the said background colour fills the spaces delimited by each of the said decorative designs or the like, even in the case where the latter have a configuration comprising at least one line closed on itself, and without appearing on the inside of the container. Application to the industry of packaging cosmetic or perfumery products or the like.

Description

 The present invention relates to pots made of at least two plastic materials of different colors, which are more particularly intended for the packaging industry for cosmetic or similar products and of which a plastic material defines the background color appearing on the outside, while at least the other matter defines the color of "logos", namely numbers, letters, etc ...

in relief or in hollow or level with respect to the external surface of the pot, which is made of said material corresponding to the background color, which "logos" are also visible outside so as to constitute decorative designs and / or information writings on the content and / or on the manufacturer (trademarks, etc.).

 Apart from the glass jars, intended for the type of aforementioned products, because they are breakable, the plastic pots currently used are single-walled or double-walled pots, using a single type of plastic. In double-walled pots there is a vacuum flair between the two walls to make them lighter, however their use is increasingly prohibited by law because they mislead the user on their actual capacity.

 It is true that there are articles in two or more plastic materials of different colors, manufactured by the technique of molding / overmolding, in particular constituted by keys of keyboards, gear shift knobs, caps of cosmetic product containers. or the like; however, this technique has never been used for pots intended to contain cosmetic or similar products, especially because of the difficulties of mastering the technique of bi-injection or multi-injection (we also speak of injection two-color or more generally multi-color injection).

 The present invention aims to provide two-color or multi-color pots made of two or more plastic materials of different colors by bi-or multi injection and having "logotypes1 or deco ratios or similar designs of one or more colors which spring from the background color of their outer surface, which pots have the following advantages in particular - a more luxurious and original presentation, - better harmonization between the color of the pot and the color of its lid, as well as between the color of the product contained therein and the color of the internal surface of the pot, - the possibility of bringing out outside "logos" or decorative designs or the like, of one or more different colors, which are level or in relief or in hollow relative to the external surface of the pot, the color of which defines the background color.

 The subject of the present invention is a process for manufacturing an at least two-color pot, namely made from at least two suitable plastics of different colors which correspond to at least two walls of the pot, one internal and the other external, in particular by bi-injection (molding and overmolding) of at least said two plastic materials of different colors, one of which has the background color of the outer wall of the pot, from which "logos" emerge (or drawings decorative or similar) which project outwards from the inner wall of the pot made of the other material of different color, and some of which are defined by at least one line closed on itself, which process is characterized in what we do, parallel to the inner wall of the pot and in the thickness of the latter, and for each "logotype" (or decorative design or the like), a passage channel for the material defining the background color of the p aroi external, which channel is in communication with the space delimited by the corresponding "logotype" (or decorative design or the like), so that, when injecting said material defining the background color, from which very closely resemble clearly the fllogotypesfl (or decorative designs or the like), this watermark fills the space delimited by each of these DlogotypesX mee in the case where the latter present a configuration comprising at least one line closed on itself, without the defined material being said background color does not appear on the internal surface of the internal wall of the pot, which remains single-color, and in that the different channels associated with each "logotype" (or decorative design or the like) are in communication with at least one channel main injection, also formed in the thickness of the inner wall of the pot parallel to the latter.

 The present invention also relates to an at least two-color pot obtained by implementing the method according to claim 1, characterized in that it comprises a composite wall constituted by the juxtaposition of an internal wall and an external wall, each made of a plastic material of different color, the color of the outer wall of which corresponds to the background color from which stand out the "logos" (or decorative drawings or the like) which, when molded with the inner wall of the pot produced in another color, protrude outwards from this internal wall, which material defining said background color fills the spaces delimited by each of the "logos" (or decorative designs or the like), even in the case where these have a configuration comprising at least one line closed on itself, without appearing on the internal surface of the internal wall of the pot, which remains single-color.

 In addition to the foregoing provisions, the invention also comprises other provisions, which will emerge from the description which follows.

The invention will be better understood with the aid of the additional description which follows, which refers to the attached drawing in which
Figure 1 repXEsente an el # ation view, partially in section, of a two-color pot confirms the present invention
FIG. 2 shows, in a vertical section only, a detail of the internal wall of the two-color pot of FIG. 1, and
FIG. 3 shows, on a larger scale, also in a vertical section view, the composite wall of the pot of FIG. 1.

 It should be understood, however, that this drawing and the corresponding descriptive parts, are given solely by way of illustration of the subject of the invention, of which they do not in any way constitute a limitation.

 Figure 1 illustrates a pot 1 according to the invention provided with its cover 2, both made of plastic.

 The pot 1 comprises a composite wall formed by juxtaposition of an internal wall 3 and an external wall 4 made of two plastics of different colors, by bi-injection (molding and overmolding3.

 Protections 5 protrude from the internal wall 3 so as to be visible outside. These projections correspond to logotypes ", namely numbers, letters, etc ..., intended to constitute decorative drawings and / or writings coming from molding and aiming to inform the user about the product which is contained in the jar (name of the manufacturer, brand, capacity, etc ...).

 With regard to the manufacturing process, there are, in particular in the case of two-tone parts, two different techniques, namely - a first technique, which consists in first injecting the material corresponding to said background color and then the material corresponding to the color of the "logotypes", and - a second technique, which consists in first injecting the material corresponding to the color of the blogotypesX and then the material corresponding to the background color.

 However, the application of the first technique in particular to the production of two-color pots would make it possible to obtain pots whose inner wall has a single color (which is imperative with this type of article), preferably identical to that of product contained therein, however, this technique has the disadvantage of poor connection between the two materials due to the withdrawal of the material from the second injection, which are made up of the "logotypes" and the internal wall of the pots thus produced.

 On the contrary, with the second technique one could obtain a tightening (therefore a good joining) of the material of the background color on the material of the "logos" and of the internal wall of the pots; however, the "logos" - which protrude from the internal wall of the pot - need to be protected against the effects of deformation due to the injection pressure of the material corresponding to the background color, which means that care must be taken passages in the inner wall of the pots to allow the material defining the background color to fill the spaces delimited by each of the "logotypes" and in particular by the wlogo- types whose configuration is delimited by one or more lines closed on them- same.

 However, since in the prior art said passages access the internal part of the pot, the material defined as the background color accesses the interior of the pot, thus eliminating the single-color appearance of their internal wall which -as it was clarified above- is imperative in this kind of articles.

 To use the advantages of this second technique, in particular the above clamping action, and to eliminate the inconvenience of the appearance inside the pot of the external material defining said background color, cleaning is carried out parallel to the wall. internal of the pot and in the thickness of the latter - and this for "logotype" chaoue - a channel 6 (cf. FIG. 2) for the passage of the material defining the background color (therefore the external wall of the pot 1), each channel 6 being in communication with the space 9 delimited by the corresponding "logo". In this way, the injection of said material defining the background color - from which the "logos" stand out - via at least one main injection channel, such as 7 in FIG. 2, and channels 6, allows this material to fill the space 9 delimited by each "logotype" even in the case of "logotypes" comprising at minus a closed line on itself, without said material defining the color of fon d for "logotypes" does not appear inside the pot.

 FIG. 3 shows the result of the injection through the main channel 7 and the secondary channels 6, which gives an external wall 4 from which the "logos" 5 stand out very clearly and which also fills said spaces 9.

 It goes without saying that this pot can be closed, in a manner known per se, by said cover 2 using the threads 8a and 8b.

 As is apparent from the above, the invention is in no way limited to those of its modes of implementation, embodiment and application which have just been described more explicitly; on the contrary, it embraces all the variants which may come to the mind of the technician in the matter, without departing from the framework, or the scope, of the present invention.

Claims (2)

REYENDICATIONS  1. method of manufacturing a pot (1-) at least two-color, namely made in at least two suitable plastics of different colors, which correspond to at least two walls (3, 4) of the pot, one internal and the other external, in particular by bi-injection (molding and overmolding) of at least said two plastic materials of different colors, one of which has the background color of the outer wall (4) of the pot (1), which emerge from the "logotypes" (5) (or decorative drawings or the like) which project outwards from the internal wall (3) of the pot (1), produced in the other material of different color, and of which some are defined by at least one closed line on itself, which process is characterized in that one cleans, parallel to the internal wall (3) of the pot (1) and in the thickness of the latter, and this for each " logotype "(5) (or decorative design or the like), a channel (6) for the passage of the material defining the color bottom of the outer wall (4), which channel (6) is in communication with the space (9) delimited by the corresponding "logotype" (5) (or decorative design or the like), so that, when the injection of said material defining the background color, from which the "logos" (5) very clearly emerge (or decorative designs or the like), this material fills the space delimited by each of these "logotypes" even in the case where the latter have a configuration comprising at least one line closed on itself, without the material defining said background color appearing on the internal surface of the internal wall (3) of the pot (1), which remains single-colored, and in that the different channels (6) associated with each "logotype" (5) (or decorative design or the like) are in communication with at least one main injection channel (7), also arranged in the thickness of the internal wall (3) of the pot (1) parallel to the latter.  2. Pot (1) at least two-color, obtained by implementing the method according to claiml, characterized in that it comprises a composite wall constituted by the juxtaposition of an internal wall (3) and an external wall ( 4), each made of a plastic material of different color, the color of the external wall (4) of which corresponds to the background color from which stand out the "logos" (5) (or decorative designs or the like) which, coming from molding with the internal wall (3) of the pot (1) produced in another color, protrude outwards from this internal wall (3), which material defining said background color fills the spaces (9) delimited by each of the "logotypes" (5) (or decorative drawings or the like), even if the latter have a configuration comprising at least one line closed on itself, and this without appearance of the interior of the pot ( 1).