Fashion item including a thin wall with locally and selectively expandable areas

Abstract

A fashion item (100) including a thin wall with locally and selectively expandable areas including: an internal core (30) made of a lining material which can expand in contact with a liquid; a support layer (10) having an external face (11) opposite an internal face (12) on which the internal core (30) is arranged, the support layer (10) being configured so that the expansion of the lining material does not substantially cause its deformation; and an impermeable covering layer (20) attached to the support layer (10) so as to tightly enclose the internal core (30), the layer including one or a plurality of through holes (21) opening onto the internal core (30) and arranged relative to each other so as to form a predefined matrix, the covering layer (20) being configured such that the expansion of the lining material substantially causes its deformation.

Claims

1. A fashion item including a flexible thin wall with locally and selectively expandable areas, wherein the thin wall comprises: an internal core made of a lining material which can expand in contact with a liquid, a support layer comprising an external face opposite an internal face on which the internal core is arranged, said support layer being configured so that expansion of the lining material does not substantially cause deformation of the support layer, an impermeable covering layer attached to the support layer so as to tightly enclose the internal core, said impermeable covering layer including one or a plurality of through holes opening onto the internal core and arranged relative to each other so as to form a predefined matrix, said impermeable covering layer being configured such that the expansion of the lining material substantially causes deformation of the impermeable covering layer.

2. The fashion item according to claim 1, wherein the lining material is composed of a hydrophilic thermoplastic elastomer material, super-absorbent fibres, and a compatibilising agent.

3. The fashion item according to claim 2, wherein the lining material is composed of a polyurethane having a hardness approximately equal to 40 shore A, from 5% to 45% by weight of super-absorbent fibres, and a compatibilising agent.

4. The fashion item according to claim 1, wherein the support layer includes a bottom wall interconnecting two side walls, said bottom walls and side walls forming a groove wherein the internal core rests.

5. The fashion item according to claim 1, wherein the support layer is made of a material having an elastic modulus greater than 10 MPa and an elongation at break less than or equal to 180%.

6. The fashion item according to claim 1, wherein the support layer is overmoulded to the internal core.

7. The fashion item according to claim 1, wherein the impermeable covering layer is produced by a laminated complex composed of an elastic flexible membrane having an elongation at break greater than 600% and a modulus of elasticity less than or equal to 20 MPa measured at 600% elongation and a stretched polytetrafluoroethylene membrane.

8. The fashion item according to claim 1, wherein the impermeable covering layer is configured to cover the internal core by overmoulding or by embossing.

9. The fashion item according to claim 1, wherein the through holes are produced by micro-perforations.

10. A bracelet comprising at least one strand including the fashion item according to claim 1.

11. A method for manufacturing a fashion item of material with a locally and selectively expandable area according to claim 1, comprising: a first attachment step wherein the impermeable covering layer and the internal core are connected to each other to form an assembly, a second attachment step wherein the support layer is connected to the assembly obtained in the first attachment step so that the support layer and the impermeable covering layer tightly enclose the internal core.

12. A method for manufacturing a fashion item of material with a locally and selectively expandable area according to claim 1, comprising: a first attachment step wherein the support layer and the internal core are connected to each other to form an assembly, a second attachment step wherein the impermeable covering layer is connected to the assembly obtained in the first attachment step so that the support layer and the impermeable covering layer tightly enclose the internal core.

Description

BRIEF DESCRIPTION OF THE FIGURES

(1) Other features and advantages of the invention will become apparent upon reading the following detailed description given by way of non-limiting example, with reference to the appended drawings wherein:

(2) FIG. 1 schematically shows a perspective view of part of a bracelet according to a preferred exemplary embodiment of the invention;

(3) FIG. 2 shows a cross-sectional view along the sectional axis A-A of FIG. 1;

(4) FIG. 3 shows a cross-sectional view along the sectional axis B-B of FIG. 1

(5) FIG. 4 shows a cross-sectional view of the bracelet of FIG. 1 assembled according to a variant embodiment of the invention.

DETAILED DESCRIPTION OF THE INVENTION

(6) FIG. 1 shows a schematic perspective representation of a preferred exemplary embodiment of a fashion item 100 including a thin wall, preferably flexible, locally and selectively expandable areas according to the invention, wherein said fashion item 100 is in the shape of a watch bracelet.

(7) It should be noted here that the fashion item 100 with locally and selectively expandable areas can advantageously be used in other applications without this leading to a change in its technical features. By way of non-limiting example, it can be in the shape of a strap, a bag, a necklace, a garment, or any other fashion item comprising a thin, preferably flexible wall.

(8) FIG. 1 illustrates a strand of a bracelet according to a preferred exemplary embodiment of the present invention comprising a support layer 10 to which a covering layer 20 is hermetically connected so as to tightly enclose an internal core 30 made of a lining material.

(9) The term “connected” means in the present description “attached”, so as to prohibit any degree of relative mobility between the elements concerned.

(10) Advantageously, the lining material is expandable in contact with a liquid.

(11) For example, the lining material can be a thermoplastic elastomer material.

(12) In a preferred exemplary embodiment of the invention, the lining material is composed of a hydrophilic thermoplastic polyurethane preferably having a hardness substantially equal to 40 shore A, from 5% to 45% by weight, for example 20%, of super-absorbent fibres known as such to the person skilled in the art, and 2% by weight of a compatibilising agent, for example polyethylene glycol.

(13) The internal core 30 can either be obtained directly by moulding, or be cut from previously manufactured plates or strips of lining material.

(14) As shown in the sectional views of FIGS. 2 and 3, the support layer 10 comprises an outer face 11 which, in the example of application of the invention shown in said figures, is intended to be oriented towards the wrist of a user when the bracelet is worn by said user, and an internal face 12 against which the internal core 30 is arranged.

(15) More particularly, in the preferred exemplary embodiment of the present invention shown in FIGS. 1 to 3, the support layer 10 includes a bottom wall 13 interconnecting two side walls 14. The side walls 14 extend in the same direction and in a direction substantially perpendicular to the direction in which the bottom wall 13 extends. It should be noted that the side walls 14 can be formed by any bulge, projection or protrusion extending from the bottom wall 13.

(16) Thus, as shown in FIGS. 2 and 3, the bottom wall 13, in combination with each of the side walls 14, forms a groove receiving the internal core 30. More specifically, the internal core 30 is dimensioned so as to rest against the internal face 12 of the bottom wall 13, and each of the side walls 14.

(17) For reasons of ease of manufacture and mechanical strength, a fillet may be formed between the internal face 12 of the bottom wall 13 and each of the side walls 14.

(18) Preferably, the support layer 10 is intended to constitute the framework of the fashion item 100 in the sense that it is intended to give said item its rigidity and its mechanical resistance to stresses.

(19) Advantageously, the support layer 10 is configured so that the expansion of the lining material does not substantially cause the deformation of said support layer 10. In other words, the support layer 10 has such resistance to the pressure forces resulting from the increase in volume of the internal core 30, that it does not deform in a manner which is perceptible to a user.

(20) Preferably, the support layer 10 is made of a material having an elastic modulus greater than 10 MPa measured at 100% elongation and an elongation at break less than or equal to 180%.

(21) Such a material can be a natural or synthetic leather, a textile or an elastomer and can be combined with non-woven textile fibres or any other suitable component in order to increase its mechanical resistance to deformation.

(22) The support layer 10 and the covering layer 20 are connected together so as to tightly enclose the internal core 30.

(23) This covering layer 20 has the particular objective of protecting the internal core 30 from possible attacks from the external environment, such as shocks, impacts or friction, exposure to ultraviolet rays, to humidity, etc., and to contribute to the solution of the problem solved by the invention as described in more detail below, in addition to playing an aesthetic role.

(24) The covering layer 20 is advantageously impermeable and includes one or a plurality of through holes 21 opening on the one hand onto the internal core 30 and on the other hand onto the external environment. The through holes 21 are arranged relative to each other so as to form a predefined matrix. The term “matrix” here means that the plurality of holes form a particular pattern. This pattern can be selected or generated randomly.

(25) These through holes 21 advantageously allow a liquid present in the environment outside the fashion item 100 to penetrate through the covering layer 20, so that said liquid locally contacts the internal core 30.

(26) For this purpose, the through holes 21 are preferably made by micro-perforations, for example of about 50 μm, spaced from each other by an appropriate distance so that the covering layer 20 maintains sufficient mechanical strength to withstand the pressure forces exerted by the expansion of the lining material of the internal core 30. Such a distance may be at least 500 μm. For example, the micro-perforations are made by laser machining.

(27) Moreover, the covering layer 20 is configured such that the expansion of the lining material substantially causes its deformation. In other words, the covering layer 20 advantageously includes significant elastic features so that the pressure forces generated locally by the expansion of the lining material deform the covering layer 20 in a manner which is perceptible to a user.

(28) More particularly, the covering layer 20 is preferably produced by a laminated complex composed of at least one elastic flexible membrane, for example made of elastomeric material, provided with an elongation at break greater than 600% and a modulus of elasticity less than or equal to 20 MPa measured at 600% elongation, and a stretched polytetrafluoroethylene membrane, for example a membrane known under the trade name “Gore-Tex”.

(29) Thus, thanks to these features, it is possible to locally cause an expansion of the lining material opposite each of the through holes 21, over a predefined area according to the distribution of said through holes 21, in a direction opposite the support layer 10, and by extension, in the preferred embodiment of the invention, on the user's wrist. So as to generate on the fashion item 100, for example on the bracelet, reliefs with an aesthetic or informative function, for example representing logos, letters or words, or any other graphic representation.

(30) Indeed, as described above, the support layer 10 and the covering layer 20 are configured so that the expansion of the lining material is carried out only in one or more directions substantially opposite the support layer 10 and oriented towards the covering layer 20. So that the reliefs are visible to a user.

(31) In a first variant embodiment of the invention, the assembly of a fashion item 100 according to the invention is carried out by a first attachment step wherein the support layer 10 and the internal core 30 are connected to each other, then by a second attachment step wherein the covering layer 20 is connected to the assembly obtained in the first attachment step, for example by gluing.

(32) A fashion item 100 assembled according to this variant embodiment is shown in the sectional views of FIGS. 2 and 3.

(33) A fashion item 100 is thus obtained wherein only the covering layer 20 is visible.

(34) This variant embodiment is preferred when the support layer 10 is made of leather.

(35) In another variant embodiment of the invention, the assembly of a fashion item 100 according to the invention is carried out by a first attachment step wherein the covering layer 20 and the internal core 30 are connected to each other, then by a second attachment step wherein the support layer 10 is connected to the assembly obtained in the first attachment step, for example by gluing.

(36) A fashion item 100 is thus obtained wherein the covering layer 20 and the support layer 10 are visible. A fashion item 100 assembled according to this variant embodiment is shown in the sectional view of FIG. 4.

(37) This variant embodiment is preferred when the support layer 10 is made of an elastomeric material, such as rubber.

(38) The covering layer 20 can also cover all or part of the external face 11 of the support layer 10, thus allowing to protect the latter from external attacks such as friction, humidity, etc.

(39) Preferably, the attachment of the support layer 10 to the internal core 30 or to the assembly formed by the covering layer 20 and the internal core 30, according to the considered variant embodiment described above, is performed by overmoulding or by gluing, so as to ensure that the expansion of the lining material is carried out in the desired directions, that is to say in directions opposite the support layer 10.

(40) Preferably again, the attachment of the covering layer 20 to the internal core 30 or to the assembly formed by the support layer 10 and the internal core 30, according to the considered variant embodiment described above, is performed by embossing or by overmoulding.

(41) The micro-perforations forming the through holes 21 can be made once the production of the bracelet has been completed, that is to say once the assembly of the support layer 10, of the internal core 30 and of the covering layer 20 completed, on the basis of instructions delivered by computer in order to produce a matrix of through holes 21 specific to a predefined graphic representation.

(42) Alternatively, the through holes 21 can be made on the covering layer 20 upstream of the assembly of the support layer 10, the internal core 30 and the covering layer 20.

(43) Thus, by modifying the shape of the matrix of through holes 21 from one fashion item 100 to another, that is to say by modifying the number of through holes 21 and/or their arrangement relative to each other, it is possible to customise the decoration of each bracelet, without changing the manufacturing processes nor the manufacturing means of said fashion items 100.