MX2008008624A - Holographic flexible tube laminate for packaging and method of making the same - Google Patents

Abstract

A holographic flexible tube laminate for packaging and a method of making the same. A flexible laminate substrate applied with an adhesive layer has a metalised holographic embossed pattern transferred onto the adhesive layer. The holographic side of the laminate substrate is further optionally applied with corona treatment, printed and applied with a protective transparent material coating. The edges of the laminate substrate without the adhesive layer are lap joined by heat sealing to form the tube laminate.

Description

LAMINATE FLEXIBLE HOLOGRAPHIC TIGHTENING FOR PACKAGING AND METHOD TO MANUFACTURE IT FIELD OF THE INVENTION This invention relates to a holographic flexible tubular laminate for packaging and to the method for manufacturing it. The engraved holographic design is incorporated into the packaging to improve the aesthetic and graphic appearance of the products contained in them and / or indicate their authenticity and avoid the cheating and counterfeiting of these products. In the sense that the term "pattern or design" is used herein, it includes one or more images, drawings, designs, monograms, logos, graphics, trademarks or names or devices, or combinations thereof.

BACKGROUND OF THE INVENTION The plastic films used for packaging are obtained with a holographic engraved design by coating them with a thermoplastic lacquer and then holographically engraving the desired design on the coating of lacquer under conditions of pressure and temperature that will depend on the nature of the lacquer used. . Optionally, the engraved holographic design is vacuum metallized and subjected to corona treatment before printing or laminating. The printed side of the films optionally has a coating of transparent protective material or the film is laminated with another film. The holographically recorded films can be used as such as packaging materials or can be transformed into containers, for example, bags of any size, or the like. In order to heat seal the union of the formed containers, the lamination of the films with holographic stamping is usually done with a heat sealable film. The cellulose paper with engraved holographic design applied by transfer, is used as packing or wrapping material. It does not have the mechanical strength to conform as flexible tubes that are used to pack semisolid or viscous materials such as toothpaste, ointments, lotions or the like. Flexible tubular laminates provided with etched holographic design used to package semi-solid or viscous materials, are manufactured by superposing and laminating holographic engraving films, processed as described above, between the layers or laminations of the laminated substrate and then transforming the laminated substrate. in a tubular laminate whose edges are heat-sealed. During prolonged periods of storage and the continuous and rigorous handling of flexible tubular laminates in which they are exposed to pressure and compression, the bond between the plastic film having the etched holographic design and the layers or laminations of the laminated substrate weakens and causes the film to break or dislodge due to which the integrity and cohesion of the tube is reduced and its appearance is deteriorated. Even if the film does not break completely there will be traces of delamination that deteriorate the integrity and cohesion and appearance of the tube. On the other hand, the definition and visibility of the engraved holographic design is reduced because the design is interleaved between laminations of the laminated substrate. The non-laminated flexible tubes used to pack viscous or semi-solid materials are usually made of aluminum and this is not susceptible to direct holographic engraving. The lamination of films with holographic engraving on aluminum tubular substrates does not guarantee a durable bond between the substrate and the film. As a result, the film will delaminate or open and deteriorate the integrity and cohesion and also the appearance or appearance of the tube.

OBJECTIVES AND ADVANTAGES OF THE INVENTION An object of the invention is to provide a holographic flexible tubular laminate for packaging, this tubular laminate is of simple construction and maintains its integrity and cohesion and also the aesthetic and graphic appearance for a long time. Another object of the invention is to provide a flexible tubular holographic laminate for packaging, this tubular laminate imparts better definition and visibility to the engraved holographic design. Another object of the invention is to provide a method for manufacturing a flexible holographic tubular laminate for packaging, this method is simple and easy to carry out and produces tubular laminates having the advantages mentioned above.

DETAILED DESCRIPTION OF THE INVENTION According to the invention, a holographic flexible tubular laminate for packaging is provided, the tubular laminate comprises a flexible laminate substrate to which an adhesive layer having an engraved metallized holographic design transferred to the adhesive layer is applied, the side The holographic substrate of the laminated substrate is then subjected, optionally, to corona treatment, printed and a protective coating of transparent material is applied, the edges of the laminated substrate are left without the adhesive layer and are joined by overlapping bonding by means of heat-sealing to form the tubular laminate.

According to the invention, there is also provided a method for manufacturing a holographic flexible tubular laminate for packaging, the method consists of the following steps: (i) transferring a recorded and metallized holographic design to an adhesive layer applied on a flexible laminate substrate leaving out the edges of the laminated substrate; (ii) optionally, applying corona treatment to the holographic side of the laminated substrate; (iii) printing the holographic side of the laminated substrate; (iv) applying a protective coating of transparent material on the printed side of the laminated substrate; and (v) forming the laminated substrate as a tube by overlapping the edges of the laminated substrate by heat sealing. Preferably, the flexible laminate substrate has a thickness of 150 to 400 microns and is formed by plastic films laminated together or plastic films and aluminum sheets laminated together. The adhesive used in the laminated substrate must have excellent adhesion to the laminate substrate. Preferably, the adhesive layer has a 1.5 to 5 GSM and includes reactive polyurethane based adhesive. Preferably, the protective coating of transparent material has a thickness of 0.5 to 5 GSM and consists of a UV curable varnish. The plastic film used for the laminated substrate or the etched holographic design is selected from polyester (PET) films, biaxially oriented polypropylene (BOPP) films, cast polypropylene (CPP) films, polyethylene polyvinyl chloride (PVC) films ) or oriented polyamide films. Instead of the aluminum sheets, other sheets can be used in the laminated substrate. Preferably, the transfer of the engraved and metallized holographic design is carried out by laminating a plastic film having the holographic design etched and metallized with the flexible laminated substrate and then removing the film. According to the invention, the engraved and metallized holographic design is transferred to the adhesive layer well adhered to the flexible laminate substrate and the edges of the laminate without the adhesive are heat sealed to form the tube. Then, the engraved holographic design is protected against damage by means of the transparent protective coating. The recorded holographic image is transferred to the surface of the adhesive layer which is well adhered to the surface of the tubular laminate. Therefore, the integrity and adhesion and also the aesthetic appearance and appearance of the tube are maintained even after long periods of storage and continuous and rigorous use for a while. The definition and visibility of the engraved holographic design is also significantly improved because it is on the surface of the tubular laminate. The tubular laminate is flexible and has the adequate mechanical strength to be used in the packing of viscous or semi-solid materials. In this way, the configuration and construction of the tubular laminate is greatly simplified. The method of the invention is also simple and easy to carry out. It is easy to understand that any flexible laminated structure can have the engraved holographic design transferred to the adhesive layer applied there according to the method of the invention. The structure thus formed does not have to be a tubular laminate and may have other shapes or may be flat. The transfer of the engraved holographic design to the adhesive layer can be done in some other way. These variations in the construction and configuration of the invention should be interpreted and understood as part of the scope of the invention. The following experimental example is illustrative of the invention and does not limit the scope thereof: 52-524 Example 1 A polyester film 12 microns thick was coated with a thermoplastic lacquer consisting of cellulose acetate propionate and polyvinyl acetate at a pressure of 1 bar and at a temperature of 115 ° C to form a coating of 1GSM thick. The film was recorded holographically and vacuum metallized and the etched and metallized holographic design was transferred to a 2.5 GSM thick reactive polyurethane adhesive layer applied to a flexible laminate substrate consisting of polyethylene films and aluminum foil and a thickness of 250 microns, through the lamination of the film with the holographic engraving and the flexible laminated substrate. The film was removed and the adhesive side of the laminated substrate carrying the design with the holographic engraving was subjected to corona treatment, then a UV curable varnish coating was applied and applied to a thickness of 1 GSM. The laminated substrate was cut lengthwise into 9 rolls, each having the design with the holographic engraving. The rolls were formed as tubes and the edges of the rolls of laminate protruding from the adhesive layer were joined by overlapping and by means of heat sealing. The tubular laminates did not delaminate or open, even after a long period of storage and continuous pressure and torsion. The 52-524 integrity and adhesion as well as the aesthetic appearance and appeal of the tubular laminates were preserved. The definition and visibility of the recorded holographic design was also excellent. 52-524

Claims (12)

1. CLAIMS: 1. A flexible tubular laminate for packaging, the tubular laminate comprises a flexible laminated substrate to which an adhesive layer has been applied on an outer surface thereof leaving its edges outside and having a holographic engraved and metallized design transferred to the adhesive layer, the holographic side of the laminated substrate is then applied corona treatment, optionally, a coating of transparent protective material constituted by a UV curable varnish is applied, the laminated substrate is folded to form a tube in the that the side of the protective material coating of the laminated substrate forms the outer part of the tube and the edges of the laminated substrate without the adhesive layer are joined by overlapping and by heat sealing to form the tubular laminate. A tubular laminate according to claim 1, wherein the adhesive layer has a thickness of 1.5 to 5 GSM and the adhesive is a reactive polyurethane-based adhesive. 3. A tubular laminate according to claim 1 or 2, wherein the flexible laminate substrate has a thickness of 150 to 400 microns and is formed by plastic films laminated together. 52-524 4. A tubular laminate according to claims 1 or 2, wherein the flexible laminate substrate has a thickness of 150 to 400 microns and is formed by plastic films and aluminum sheets laminated together. A tubular laminate according to any of claims 1 to 4, wherein the protective transparent material coating has a thickness of 0.5 to 5 GSM. 6. A method for making a flexible holographic tubular laminate for packaging, the method consists of the following steps: (i) transferring a recorded and metallized holographic design to an adhesive layer applied on a flexible laminate substrate leaving out the edges of the laminated substrate; (ii) optionally, applying corona treatment to the holographic side of the laminated substrate; (iii) printing the holographic side of the laminated substrate; (vi) applying a protective coating of transparent material on the printed side of the laminated substrate; and (vii) forming the laminated substrate as a tube by overlapping the edges of the laminated substrate by heat sealing. A method according to claim 6, wherein the transfer of the etched and metallized holographic design is carried out by lamination of a plastic film having the etched and metallized holographic design, on the flexible laminated substrate and subsequent delamination of the film. 8. A method according to claim 6 or 7, wherein the adhesive layer has a thickness of 1.5 to 5 GSM and is a reactive polyurethane-based adhesive. 9. A method according to any of claims 6 to 8, wherein the flexible laminate substrate has a thickness of 150 to 400 microns and is formed by plastic films laminated together. A method according to any of claims 6 to 8, wherein the flexible laminate substrate has a thickness of 150 to 400 microns and is formed by plastic films and aluminum sheets laminated together. 11. A method according to any of claims 6 to 10, wherein the coating of 52-524 transparent protective material has a thickness of 0.5 to 5 GSM. A method according to any of claims 6 to 11, wherein the edges of the laminated substrate are subjected to heat sealing by inductive heating or welding.