• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    Retroreflective sheet and process for obtaining it, comprising a layer (2) of transparent plastic material upper (2a) smoothly and inferiorly (2b) composed of multiple micro-shapes (2c) hemispherical; a focuser layer (3), attached to the multiple semi-spherical micro-shapes (2c) of the wrapped layer (2), also of transparent plastic; and a metallized layer (4) attached behind the focuser layer (3). It also comprises a film of protective film (5) transparent covering top layer wrapped (2), and permanent adhesive (6) with silicone sheet (7) protection. The method comprises making the semi-spherical micro-forms (2c) of the wrapped layer (2) by continuous die-stamping (8), either by heating the mold or with uv curable resin. (Machine-translation by Google Translate, not legally binding)
    公开号:ES2624501A1
    申请号:ES201630021
    申请日:2016-01-13
    公开日:2017-07-14
    发明作者:Enrique Sánchez Casadevall；Francesc TAULER SALA；Joaquim DE CIURANA GAY；Jéssica GOMAR PINA
    申请人:Industrias Samart SA；
    IPC主号:
    专利说明:

    5 OBJECT OF THE INVENTION
    The invention, as expressed in the statement of the present specification, refers to a retro-reflective sheet and the method of obtaining it, contributing, to the function to which it is intended, advantages and novelty characteristics, which will be described. in
    10 detail below, which represent a remarkable improvement in the current state of the art.
    More specifically, the object of the invention focuses on a retro-reflective sheet, for example applicable for the preparation of license plates or other road marking elements, whose structural configuration has the particularity of understanding, 15 as a surface responsible for reflecting the incident rays, a wrapped layer of transparent plastic material that has a lower surface composed of multiple hemispherical micro shapes, made by a continuous mold etching process, a focusing layer, also of transparent plastic material, attached under the mentioned hemispherical shapes, whose thickness determines the focal length, and a layer
    20 metallized in charge of returning the incident rays, a second aspect of the invention being the process for obtaining said layers.
    FIELD OF APPLICATION OF THE INVENTION
    The field of application of the present invention is part of the industry sector dedicated to the manufacture of reflective products and materials, in particular retroreflective sheets, also called retro-reflective sheets, applicable, for example, for the preparation of license plates or road signage panels. 30 BACKGROUND OF THE INVENTION
    As is known, a retro-reflector is an element or surface that reflects the light back to the source, regardless of the angle of incidence.
    35 The properties of the reflectors are used to increase the visibility of


    objects in low light conditions, so they are used as active road safety elements. They become especially useful in this field because the light source and the observer are located approximately in the same direction that links the source and the retro-reflector. They are installed in vehicles, vests, sportswear, or on asphalt,
    5 delimiting the lanes. They are also used as background of the license plates of thevehicles, so that your code can be easily read from any angle, providedwhen illuminated from the observation direction.
    In any case, to achieve a retro-reflective or retro-reflective surface, up to
    10 Now, the application of a multitude of micro spheres or micro prisms has been used as a focusing layer to reflect the light, since they act as small cat eyes that reflect the light in the direction from which it comes. However, the manufacture of these types of surfaces is not of good quality or requires large technological resources. In fact, there are few manufacturers of reflective materials that can
    15 offer certified quality guarantees, since to meet the requirements in certain areas, including road safety, the back of the material must comprise several thousand of said micro spheres or micro prisms attached to each square centimeter of a film that It supports. In addition, the micro spheres must be all regular in size and in the case of micro prisms, they must be
    20 precise in order to reflect the light correctly again. Consequently, the manufacture of quality retro-reflective products implies a high economic cost.
    The objective of the present invention is therefore the development of a new type of reflective sheet that, by means of an innovative structure much simpler but equally
    25 effective in its mission, it allows a manufacturing process by continuous process much more practical to achieve a high production capacity at a significantly lower cost.
    On the other hand, and as a reference to the current state of the art, it should be noted that, at least 30 by the applicant, the existence of any other retro-reflective sheet is unknown.
    or similar invention that has technical, structural and constitutive characteristics similar to those specifically presented here, as claimed.

    EXPLANATION OF THE INVENTION
    Thus, the retro-reflective sheet and the procedure for obtaining it that the invention proposes are configured as a novelty within its field of application, since according to its implementation and in a restrictive way the aforementioned objectives are satisfactorily achieved, the characterizing details making it possible and distinguishing it conveniently set out in the final claims accompanying the present description.
    Specifically, what the invention proposes, as noted above, is a retro-reflective sheet, mainly applicable for the preparation of license plates or other road signs such as panels or signs, although without limiting, whose structural configuration, instead of a surface formed by multiple micro spheres or glass micro prisms thanks to which the light is reflected in multiple directions, such as those responsible for focusing and reflecting the incident rays comprises: a main layer, which we will call the wrapped layer , of transparent plastic material whose upper face (where the light strikes) is smooth but whose lower face, that is to say the opposite, has multiple micro shapes of hemispherical geometry; a focusing layer attached behind said surface of hemispherical forms of the underside of the wrapped layer, also of transparent plastic material, which adopts the same configuration of hemispherical forms and whose thickness is variable, as desired; and a metallic layer attached, in turn, after the focusing layer and also adopting the same configuration of hemispherical forms, responsible for returning the rays of light incident on the sheet.
    It should be mentioned that the hemispherical forms of the wrapped layer and, consequently of the focusing layer and the metallized layer, are of varying diameter, depending on the degree of retro-reflection that is desired to be obtained.
    The sheet of the invention further comprises a transparent protective film film that covers the entire surface of the wrapped layer on the upper side of the light, the function of said film being to protect the micro structure of said layer of the external factors.
    Finally, the sheet preferably comprises a permanent adhesive layer incorporated on the back side thereof, after the metallized layer, in order to adhere the sheet to the final substrate under normal conditions of use.


    Also preferably, said adhesive layer is provided with a removable silicone sheet designed to protect the adhesive layer during the handling of the sheet until it is placed on the final substrate.
    Also, a second aspect of the invention relates to the method of obtainingsaid sheet according to which, for the realization of the described layer wrapped with microstructure of hemispherical forms in one of its faces, it comprises the application of aContinuous mold etching procedure.
    10 Specifically, the use of a coil-to-coil lithographic nano-stamping procedure (Roll to Roll Nanoimprinting lithography) is contemplated, which is carried out in two different ways: either by temperature heating, or by using a resin curable by UV radiation (ultraviolet).
    15 Thus, in the first case, a heated mold is used, where the plastic material is heated to the glass transition temperature when it comes into contact with the engraved mold, after which a pressure is generated that makes the material flow by filling the inside of the micro-engraved mold cavities. After that, it is allowed to cool and separates.
    In the second case the plastic material intended to form the wrapped layer of hemispherical micro shapes is covered with a UV curable resin. And, when it comes into contact with the engraved mold, the material is pressed together with the resin. Due to the capillary force of the liquid material, the resin fills the micro cavities of the mold. A UV light source is applied and the curable resin solidifies, obtaining the micro geometry of hemispheres in the
    25 plastic material.
    In any case, the process preferably comprises the use of a mold in the form of an engraved roller, allowing the surface of the geometry of the microspheres to be generated in the plastic material of the wrapped layer from sheets of material
    30 arranged in reels that are recorded continuously, eliminating breaks for demolding.
    Finally, following the steps of the process for obtaining the sheet of the invention, it should be noted that the application of heat is contemplated, by any
    35 appropriate thermal process, to apply the protective film to the wrapped layer.


    The aforementioned retro-reflective sheet and the procedure for obtaining it represent, therefore, an innovation of structural and constitutive characteristics unknown until now, reasons that together with its practical utility, provide it with sufficient grounds to obtain the privilege of exclusivity that is request. DESCRIPTION OF THE DRAWINGS
    To complement the description that is being made and in order to help a better understanding of the characteristics of the invention, a descriptive report, as an integral part thereof, of a set of drawings, in which Illustrative and non-limiting nature has represented the following:
    Figure number 1.- Shows a schematic sectional view of a portion of the retro-reflective sheet, object of the invention, showing the parts and elements it comprises, as well as the configuration and arrangement of each of them.
    Figure number 2.- Shows a schematic elevation view of a representation of the molding phase of the focusing layer of the sheet of the invention, according to its manufacturing process.
    20 And figure number 3. - It shows the configuration of the mold in the form of a roller to make the aforementioned focusing layer of the sheet in continuous process. PREFERRED EMBODIMENT OF THE INVENTION
    25 In view of the aforementioned figures, and according to the numbering adopted, an example of the recommended retroreflective sheet can be observed therein, which comprises the parts and elements indicated and described in detail below.
    30 Thus, as observed in said figures, the sheet (1) in question essentially comprises to focus and reflect the incident rays:
    - a wrapped layer (2) of transparent plastic material whose upper surface (2a) is smooth while the opposite or lower surface (2b) is composed of multiple micro shapes (2c) of hemispherical geometry;


    - a focusing layer (3) which, attached behind the lower face (2b) of surface composed of hemispherical forms (2c) of the wrapped layer (2), is also constituted of transparent plastic material and adopts the same configuration of said hemispherical forms;
    5 -and a metallic layer (4) attached, in turn, after the focusing layer (3) adoptingalso the same configuration of hemispherical forms, responsible for returninglight rays incident on the sheet.
    It should be mentioned that the hemispherical micro shapes (2c) of the wrapped layer (2) and,
    10 consequently of the focusing layer (3) and the metallized layer (4), are of variable diameter, depending on the degree of retro-reflection that is desired to be obtained, it is important to emphasize that the focusing layer (3) is of variable thickness , since its thickness determines the focal length at which it is desired to work.
    The sheet of the invention further comprises a transparent protective film film (5) that covers the entire surface of the wrapped layer (2), which is the function of the light layer, which is the function of said film protect the microstructure said layer from external factors.
    Preferably, the sheet also comprises a permanent adhesive layer (6) incorporated after the metallized layer (4), in order to be able to adhere the sheet to the final substrate, which, also preferably, is provided with a siliconized sheet (7) Removable protection until use.
    25 As regards the process for obtaining said sheet (1), it includes at least one phase for the realization of the hemispherical micro-shapes (2c) of the wrapped layer (2), which contemplates the application of mold stamping (8) continuously on the plastic material (9) to be said layer. In figure 2 the mold (8) is schematically represented with the micro-engraving (10) of the structure in the form of
    30 hemispheres and the piece of plastic material (9) incorporated on a substrate (11) that will serve as a support during the time of application of the stamping, which can be carried out in two different ways: by heating the mold, or either incorporating a UV-curable resin into the plastic material (9).
    Preferably, the mold (8), as shown in Figure 3, is a roller with the micro engraving


    (10) on its perimeter surface, and the plastic material (9) is arranged in coils so that it is passed, conveniently secured with tensioners (12), continuously between said mold (8) and a substrate (11) that press it.
    Preferably, in said mold etching process (8), the formation of the wrapped layer (2), the focusing layer (3) and the metallized layer (4) are carried out together.
    The procedure also contemplates at least another phase of heat application, to
    10 incorporate the protective film film (4) on the upper surface (2a) of the wrapped layer (2).
    Describing sufficiently the nature of the present invention, as well as the way of putting it into practice, it is not considered necessary to extend its explanation so that
    15 Any expert in the field understands its scope and the advantages that derive from it, stating that, within its essentiality, it may be implemented in other embodiments that differ in detail from that indicated by way of example, and which will also achieve the protection that is sought as long as it is not altered, changed or modified its fundamental principle.

    权利要求:
    Claims (7)
    [1]
     R E I V I N D I C A C I O N E S
    1.-RETRO-REFLECTING SHEET characterized by comprising a wrapped layer (2)of transparent plastic material whose upper surface (2a) is smooth and the opposite or lower5 (2b) is composed of multiple micro forms (2c) of hemispherical geometry; a Capefocalizer (3), attached behind the underside (2b) of a surface composed of multiplehemispherical micro shapes (2c) of the wrapped layer (2), also made of materialtransparent plastic and adopting the same configuration of said hemispherical forms; Ya metallic layer (4) attached, in turn, after the focusing layer (3) adopting
    10 also the same configuration of hemispherical forms, responsible for returning the light rays incident on the sheet.
    [2]
    2.-RETRO-REFLECTING SHEET, according to claim 1, characterized in that the hemispherical micro-shapes (2c) of the wrapped layer (2) are of variable diameter, depending on the degree of back-reflection desired to be obtained.
    [3]
    3.-RETRO-REFLECTING SHEET, according to claim 1 or 2, characterized in that, the focusing layer (3) is of variable thickness, determining the focal distance at which it is worked.
    20 4.-RETRO-REFLECTING SHEET, according to any one of claims 1 to 3, characterized in that it also comprises a transparent protective film (5) that covers superiorly, that is to say, on the face of light incidence, all the surface of the wrapped layer (2).
    5. RETRO-REFLECTING SHEET, according to any one of claims 1 to 4, characterized in that it comprises a permanent adhesive layer (6) incorporated after the metallized layer (4), to adhere the sheet to the final substrate.
    6. PROCEDURE for obtaining a retro-reflective sheet as described in claims 1 to 5, characterized in that, at least, it comprises a phase for the realization of the hemispherical micro-shapes (2c) of the wrapped layer (2) which contemplates the application of embossing by stamping with mold (8) in continuous on the plastic material
    (9) that should constitute said layer. 35

    [7]
    7. PROCEDURE according to claim 6, characterized in that the stamping with mold (8) is carried out by heating the mold.
    [8]
    8. PROCEDURE according to claim 6, characterized in that stamping with 5 mold (8) is carried out by incorporating a UV-curable resin into the plastic material (9).
    [9]
    9.-PROCEDURE, according to any of claims 6 to 8, characterized in that the mold (8) is a roller with the micro-engraving (10) on its perimeter surface, and the plastic material (9) is arranged in coils so which is passed continuously between said mold (8) and a substrate (11) that presses it.
    [10]
    10.-PROCEDURE, according to any of claims 6 to 9, characterized in that, in addition, it comprises a heat application phase, to incorporate the protective film film (5).
    13 01 2016
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    同族专利:
    公开号 | 公开日
    ES2624501B1|2018-04-24|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    US3963309A|1972-12-15|1976-06-15|D. Swarovski & Co., Glasschleiferei|Reflex light reflector sheet and method for its manufacture|
    WO1998022837A1|1996-11-19|1998-05-28|Minnesota Mining And Manufacturing Company|Rectroreflective sheet|
    WO2002050578A2|2000-12-21|2002-06-27|Giorgio Corradi|A reflector film and a process for manufacture thereof|
    US20140247408A1|2013-03-01|2014-09-04|Yu-Chen Hwang|Multi-purpose electrical window andmethods thereof|
    法律状态:
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