• 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 focus layer (2) of transparent plastic composed of multiple hemispherical micro-shapes (2a), with variable thickness and diameter, encapsulated by determining a hemispherical air chamber (3) with total internal reflection. In addition, a metallized layer (5) on the face opposite to that of incidence, and transparent protective film (4) sealing the encapsulation of the semi-spherical micro shapes (2a). It also comprises a permanent adhesive layer (6) with a siliconized protection sheet (7). And the process comprises the realization of the semi-spherical micro-forms (2a) of the focusing layer (2) with application of engraving by stamping with mold (8) in continuous, either by heating the mold or with resin curable by uv radiation. (Machine-translation by Google Translate, not legally binding)
    公开号:ES2624536A1
    申请号:ES201630022
    申请日:2016-01-13
    公开日:2017-07-14
    发明作者:Francesc TAULER SALA；Joaquim DE CIURANA GAY；Enrique Sánchez Casadevall；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 is focused on a retro-reflective sheet, for example applicable for the preparation of license plates or other road signs, whose structural configuration has the particularity of understanding, 15 as a surface in charge of focusing the incident rays, a layer of plastic material composed of multiple micro forms of hemispherical structure, which, in addition, are encapsulated so that the concave surface of each determines an air chamber where a total internal reflection (IRR) occurs, a second aspect of the invention being the method of obtaining said sheet according to which, for the
    The embodiment of the microstructure of encapsulated hemispherical forms uses a continuous mold etching process.
    FIELD OF APPLICATION OF THE INVENTION
    The field of application of the present invention falls within the sector of the industry dedicated to the manufacture of reflective products and materials, in particular retroreflective sheets, also known as retro-reflective, applicable, for example, for the manufacture of plates of license plate or road sign 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, defining the lanes. They are also used as a background for vehicle registration plates, so that your code can be easily read from any angle, as long as it is illuminated from the observation direction.
    In any case, to achieve a retro-reflective or retro-reflective surface, until 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 eyes of Cat that reflect the light in the direction it comes from. 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 offer certified quality guarantees, since in order 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 supports. In addition, the micro spheres must be all regular in size and in the case of micro prisms, they must be 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 effective in its mission, allows a manufacturing process by continuous process much more practical to achieve a high production capacity at a noticeably lower cost.
    On the other hand, and as a reference to the current state of the art, it should be noted that, at least by the applicant, the existence of no 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, being the characterizing details that make it possible and that
    5 distinguish it conveniently from the final claims that accompanyThis description.
    Specifically, what the invention proposes, as noted above, is a retro-reflective sheet, for example applicable for the preparation of license plates 10 or other road signs such as panels or signals, but without implying a limitation, whose structural configuration, instead of a surface formed by multiple micro spheres or micro glass prisms thanks to which the light is reflected in multiple directions, comprises a focusing layer of transparent plastic material composed of multiple micro shapes of hemispherical geometry as the ones in charge of
    15 focus the incident rays, which, in addition, are encapsulated so that the concave surfaces of said hemispheres, in each, determines the limits of a hemispherical air chamber where a total internal reflection (IRR) occurs.
    It should be mentioned that the hemispherical forms of the aforementioned focusing layer are of variable 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 described focusing layer, which is formed by the hemispherical micro-forms of plastic material, on the face of incidence of light.
    25 and the air chambers, the function of said film being to protect the microstructure of the external factors to avoid any unwanted deterioration.
    Likewise, the sheet comprises a metallized layer incorporated in the opposite face of the focusing layer, responsible for returning the light rays incident on the sheet.
    Finally, the sheet preferably comprises a permanent adhesive layer incorporated on the back of the sheet, 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 siliconized sheet.


    Removable 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 obtaining
    5 said sheet according to which, for the realization of the described focusing layer with microstructure of hemispherical forms, it comprises the application of a method ofContinuous mold engraving.
    Specifically, a lithographic nano-stamping procedure is applied coil to coil
    10 (Roll to Roll Nanoimprinting lithography), which can be carried out in two different ways: either by temperature heating, or by using a resin curable by UV (ultraviolet) radiation.
    Thus, in the first case, a heated mold is used, where the material is heated
    15 to the glass transition temperature. And, once the material reaches said temperature, when it comes into contact with the engraved mold, a contact pressure is generated that makes the material flow filling the interior of the mold cavities, which in fact is a recorded micro mold. After that, it is allowed to cool and separates.
    In the second option, with UV curable resin, the plastic material intended to form the layer of hemispherical micro shapes is covered with a UV light curable resin. Then, the coated material comes into contact with the mold that carries the engraving to be formed, the material being pressed together with the resin. Due to the capillary force of the liquid material, the resin fills the cavities of the micro structure of the mold. A source is applied.
    25 of UV light and the curable resin solidifies, obtaining after the demoulding the micro geometry of hemispheres in the plastic material.
    In addition, for the application of any of both options, the method preferably includes the use of a mold in the form of an engraved roller, allowing generating
    30 the geometry of micro hemispheres in the plastic material arranged in coils continuously, eliminating pauses for demolding.
    Finally, following the steps of the process for obtaining the sheet of the invention, it should be noted that, to create the sealing and, therefore, the encapsulation, of the micro
    35 forms of hemispherical geometry of plastic material of the focusing layer and, in turn,


    generate the air chambers on the concave surface of each hemisphere, the application of heat is contemplated, by any appropriate thermal process, to seal the protective film film together with said focusing layer, logically, so that said sealing occurs only in the edges of the mentioned hemispheres.
    5 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 It is requested. 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 that 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.
    25 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
    In view of the aforementioned figures, and in accordance with 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.
    Thus, as seen in said figures, the sheet (1) in question comprises a layer


    focalizer (2) of transparent plastic material composed of multiple micro shapes (2a) of hemispherical geometry responsible for focusing the incident rays, which are encapsulated so that each of said said hemispherical micro shapes (2a) determines an air chamber hemispherical (3) where a total internal reflection occurs 5 (IRR).
    It is worth mentioning that the hemispherical micro shapes (2a) of the aforementioned focusing layer (2) are of varying thickness and diameter, depending on the degree of retro-reflection desired.
    The sheet of the invention further comprises a transparent protective film film (4) that covers the focusing layer (2) superiorly, also acting as a sealant for the encapsulation of the hemispherical micro shapes (2a) and the formation of the hemispherical air chambers (3).
    Likewise, the sheet comprises a metallized layer (5) incorporated in the opposite face of the focusing layer (2), responsible for returning the light rays incident on the sheet.
    Preferably, the sheet also comprises a permanent adhesive layer (6) 20 incorporated after the metallized layer (5), in order to be able to adhere the sheet to the final substrate, which is provided with a removable silicone sheet (7) for protection until it is used .
    As for the method of obtaining said sheet (1), it comprises at least one phase for the realization of the hemispherical micro-shapes (2a) of the focusing layer (2), which includes the application of embossing by mold stamping ( 8) continuously on the plastic material (9) to be said layer. In figure 2 the mold (8) with the micro-engraving (10) of the structure in the form of hemispheres and the piece of plastic material (9) incorporated on a substrate (11) that will serve as a support during the moment of stamping application, which can be
    30 carried out in two different ways: by heating the mold, or by incorporating a resin curable by UV radiation 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 presses it.
    The process also contemplates at least another phase of heat application, to create the sealing of the edges of the micro-shapes (2a) of hemispherical geometry of the focusing layer 5 (2) with the protective film film (4) and, in turn, generate the hemispherical air chambers (3).
    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
    10 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 does not alter, change or modify its fundamental principle.

    权利要求:
    Claims (6)
    [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 focusing layer
    (2) of transparent plastic material composed of multiple micro shapes (2a) of
    5 hemispherical geometry to focus the incident rays, which are foundencapsulated so that each of said hemispherical micro shapes (2a) determinesa hemispherical air chamber (3) where there is a total internal reflection, existing,also a metallic layer (5) incorporated in the face of the opposite focusing layer (2)to the incidence of light, responsible for returning the light rays incident on the sheet.
    2. RETRO-REFLECTING SHEET, according to claim 1, characterized in that the hemispherical micro-shapes (2a) of the focusing layer (2) are of thickness and of variable diameter, depending on the degree of retro-reflection that is desired to obtain .
    3. -RETRO-REFLECTING SHEET, according to claim 1 or 2, characterized in that, in addition, it comprises a transparent protective film film (4) that covers the focusing layer (2) superiorly.
    [4]
    4.-RETRO-REFLECTING SHEET, according to claim 3, characterized in that the
    20 transparent protective film film (4) that covers the focusing layer (2) superiorly is the sealant for encapsulating the hemispherical micro shapes (2a) determining the hemispherical air chambers (3).
    [5]
    5.-RETRO-REFLECTING SHEET, according to any of claims 1 to 4,
    25 characterized in that, in addition, it comprises a permanent adhesive layer (6) incorporated after the metallized layer (5), to adhere the sheet to the final substrate.
    [6]
    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
    30 realization of the hemispherical micro forms (2a) of the focusing layer (2) which contemplates the application of continuous embossing with mold (8) on the plastic material (9) to be constituted by said layer.
    [7]
    7. PROCEDURE according to claim 6, characterized in that stamping with mold (8) is carried out by heating the mold.

    [8]
    8. PROCEDURE according to claim 6, characterized in that the stamping with mold (8) is carried out by incorporating a resin curable by UV radiation into the plastic material (9).
    5. 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. PROCEDURE, according to any of claims 6 to 9, characterized in that, in addition, it comprises a heat application phase, to create the sealing of the edges of the micro-shapes (2a) of hemispherical geometry of the focusing layer ( 2) with the protective film film (4) and generate the hemispherical air chambers (3).
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    同族专利:
    公开号 | 公开日
    ES2624536B1|2018-04-24|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    EP0385746A1|1989-03-01|1990-09-05|Atom Chemical Paint Co., Ltd.|High-brightness all-weather type pavement marking sheet material|
    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|
    JP2006009541A|2004-06-24|2006-01-12|Ssc:Kk|Indication board for road construction work|
    法律状态:
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