FR2525562A1 - Plastic mouldings with contrasting pattern - exposed from underlying moulding, to provide reproducible and durable markings - Google Patents

Abstract

A moulded container, such as a small box, having a surface pattern in a contrasting colour is produced by a two stage moulding process in which one layer is moulded in the shape required and to a reduced thickness except for the zones corresponding to the shape of the required pattern, which are moulded to the full wall thickness. The remainder of the wall thickness is then moulded in matl. of contrasting colour, to provide the visible surface for all but the distinctive pattern. Pref. the two moulding matls. are of similar or compatible plastics matls. The resulting pattern is more durable than one applied by printing, transfers or paint.

Description

The present invention relates to a method for manufacturing a packaging or a packaging element which consists of at least two adjoining walls and which has a pattern. It also relates to the products thus obtained. Such packaging is encountered in particular in the field of cosmetics.
I their techniques are currently used to manufacture packaging or packaging elements which include a label. In general, they all have in common the fact that the packaging or the packaging element is first produced, but they differ in the methods for affixing the motif which may consist of a mark, verbal or figurative. , an advertising slogan or a drawing. This can be done by stamping: the pattern obtained is then painted by hand to make it stand out. This method is relatively expensive in terms of labor and does not always make it possible to obtain a pattern of impeccable clarity.

Another method is to mark cold or hot by interposing a marking paper: it needs to be used with great care. As another possible method, there is screen printing or offset printing, the advantages and disadvantages of which are well known.

 One of the aims of the present invention is therefore to provide a method making it possible to obtain a packaging or a packaging element consisting of at least two adjoining walls and comprising a pattern of very great clarity.

 Another object of the invention is to provide a process of this type which is fully automated.

 A further object of the invention is to provide such a method, the costs of labor and time are very low compared to current techniques and compared to the cost of the packaging or the packaging element. .

 An object of the present invention is an inexpensive packaging or packaging element having a very clear pattern.

These objects and this object, as well as others which will appear subsequently, are obtained by a process for manufacturing, according to the present invention, a package or a packaging element consisting of at least two adjoining walls, an inner wall. and an outer wall, and having a pattern, which comprises the following steps
a) molding of the interior wall which thus comprises the pattern;
b) overmolding of the outer wall on the inner wall from the step without overlapping the pattern.

 Preferably Crence, molding and overmolding are carried out by injection of plastic materials.

 Advantageously, before step b) there is a counter-imprint on the pattern carried by the inner wall at the end of step a).

 Preferably, the interior and exterior walls are made of plastic materials of different colors.

 The present invention also relates to a packaging or a packaging element which consists of at least two adjoining walls, an inner wall comprising a pattern and an outer wall covering the previous one except at the level of the pattern.

 Preferably, the interior and exterior walls are of different colors.

 Advantageously, the interior wall includes the relief pattern.

The description which follows and which is in no way limiting, should be read with reference to the appended figures, among which
Figure 1 shows a packaging element such as a cover, according to the present invention, seen from above
Figure 2 is a sectional view along the line II-II of Figure 1.

 As can be seen in these figures, a packaging element such as for example a cover consists of two walls joined to one another: an inner wall 1 and an outer wall 2, and which has a pattern 3.

The method for manufacturing such a cover includes the following steps
a) the inner wall 1 is molded by injection on which the pattern 3 appears in relief because the injection mold has the imprint of this pattern
b) an overmoulding is carried out on the inner wall obtained in step a) of the outer wall by injection without overlapping of the pattern 3.

 According to a preferred embodiment of the invention, the two walls are made of plastic materials of different colors so that the pattern 3 is well highlighted. Before molding and in order to protect the pattern carried by the interior wall, it can be covered with a counter-impression.

 When the pattern 3 is in relief on the inner wall 1, the outer wall 2 is substantially flush with the pattern so that it appears slightly hollow.

 Obviously, the present invention is in no way limited to the manufacture of a cover as described above, but must be extended to that of any packaging element or of any packaging. In particular, a person skilled in the art will know how to adapt this process to the manufacture of products made up of more than two adjoining walls, this making it possible to obtain patterns with several colors or special effects.

 As has been said, the present invention also relates to a package or a packaging element consisting of at least two adjoining walls, an inner wall 1 comprising a pattern 3 and an outer wall 2 covering the previous one except at the level of the pattern.

Claims (5)

 1.- Method for manufacturing a packaging or a packaging element consists of at least two adjoining walls, one  inner wall and an outer wall and comprising a pattern,  characterized in that it comprises the following stages:  a) molding of the interior wall 1 which thus comprises the  motif 3  b) overmolding of the outer wall 2 on said inner wall  1 after step a) without overlapping said pattern.  2.- Method according to claim 1, cal-act-  laughed at in that the molding and overmolding are carried out by  injection of plastic materials.  Method according to one of the claims  1 and 2, characterized in that one has before said step b)  a counter-impression on said pattern 3 carried by the inner wall  after step a).  4.- Method according to any one of the returns  dications 1 to 3, characterized in that said inner walls  1 and exterior 2 are made of colored plastic materials  different.  5.- Packaging or packaging element obtained by  the method according to any one of claims 1 to 4, charac  terized in that it consists of at least two adjoining walls,  an interior wall 1 comprising a pattern 3 and an exterior wall  rieure 2 covering the previous one except at the level of said motif.  6. Packaging or packaging element according to claim 5, characterized in that said inner walls  and exterior are different colors.  Packaging or packaging element according to either of Claims 5 and 6, characterized in that the said wall  interior has said embossed pattern.