Method for forming reflecting images on an intermediate sheet for transfer printing

Abstract: The invention relates to a method for reproducing on a flexible film reflecting images which can be hot-transferred to a plurality of different materials, the method comprising a first processing step in which a polyester film is processed by a thermoplastic resin in an aromatic solution, a second processing step in which on the film are deposited a plurality of glass beads, in an adjoining relationship, a resin priming processing step for allowing the glass beads to be properly locked, a further processing step by using a vinylchloride-vinylacetate-aromatic solvent solution with an addition of a metal powder having high mirror-like properties in order to allow the glass beads to refract the light, and a color printing step for printing any desired colors on desired regions, as well as a further levelling processing step for the reproduced images, and a final processing step by using a thermo-transferring solution in order to allow the printed images to be transferred under temperature and pressure.

Description: BACKGROUND OF THE INVENTION The present invention relates to a method for reproducing on a flexible film reflecting images which can be hot-transferred to a plurality of different materials. Though heat transferable films are known from JP-A-05177995, a method for producing heat transferable relief marks adapted to be fixed onto a fabric is known from FR-A-2305103 and a print fabric having reflective ability is known from JP-A-09119079, no reliable and economic methods are known for reproducing on flexible films a plurality of different images, in particular reflecting images, which images can be hot-transferred to several different materials such as: PP-ABS, PE, PU, PS, PA6, rubber, synthetic and natural fabrics, leather and metal materials and the like. SUMMARY OF THE INVENTION Thus, the aim of the present invention is to provide a method for reproducing on a flexible films reflecting images, which images could be hot transferred onto a plurality of different materials, in particular, though not exclusively, on plastics materials. Within the scope of the above aim, a main object of the present invention is to provide such a method specifically designed for making said reflecting images in a very simple and unexpensive manner. Yet another object of the present invention is to provide such a reflecting image making method which is very reliable and safe in operation. According to one aspect of the present invention, the above mentioned aim and objects, as well as yet other objects, which will become more apparent hereinafter, are achieved by a method for reproducing on a flexible film reflecting images, which can be hot-transferred onto a plurality of different materials, said method being characterized by the features of the main claim 1. More specifically the invention provides a method for reproducing on a flexible film reflecting images, which can be hot transferred to a plurality of different materials, said method being characterized in that it comprises a first processing step in which a polyester film is processed by an aromatic solution of a thermoplastic resin, a second processing step in which on said film a plurality of glass beads, in an adjoining relationship are deposited, a resin priming processing step for allowing said glass beads to be locked, a further vinylchloride-vinylacetate solution in an aromatic solvent processing step by adding a metal powder having high mirror-like properties to allow said beads to refract the light, and a printing step in which desired regions are printed in colors for providing a desired image, as well as a further levelling step to a desired thickness, and a finishing processing step by using a thermotransferring solution in order to provide the printed image with the capability of being thermally transferred under pressure onto said materials. According to a preferred embodiment of the present invention, the first polyester film processing step is carried out by a thermoplastic resin including a styrene-isoprene copolymer having a styrene contents of 15%, which is spread at 34 msh and contemporaneously stabilized at 50°C by hot air. According to another preferred embodiment of the present invention, the glass beads are deposited at 77 msh and have a reflecting index of 1.9 with a diameter from 40 to 60 µm [microns]. The priming processing step is carried out by using a vinylchloride-vinylacetate resin in an aromatic solution with a deposition at 150 msh and with a thermosealing at 50°C in forced hot air. Further details, advantages and other important features of the present invention will become more apparent hereinafter from the following detailed disclosure of a preferred embodiment of the inventive method, which is given by way of a not limitative example of several possible variations of the invention. More specifically, the invention relates to a method for reproducing on a flexible film reflecting images, which are adapted to be hot transferred to several other materials such: PP-ABS, PE, PU, PS PA6, rubber, synthetic and natural fabrics, leather and metal materials. The subject method comprises the step of depositing a plurality of crystals, having a well defined pattern, which crystals are adapted to be transferred, by heat and pressure, onto one of the above mentioned materials. At first, a 35/50 µm [micron] thickness polyester film is processed by a copolymeric styrene-isoprene thermoplastic resin having a styrene contents of 15%, by an aromatic solution of said resin and spreading it at 34 msh and simultaneously stabilizing it at 50°C by using hot air. Then, a plurality of glass beads are deposited at 77 msh, said glass beads having a refracting or reflecting index of 1.9 and a diameter from 40 to 60 µm [microns], the glass beads being arranged in a mutual adjoining relationship. A following polymerizing processing by using a vinylchloride-vinylacetate resin in an aromatic solution with deposition at 150 msg will allow the glass beads to be locked in order to resist against the following processing steps. During this step, thermosealing at 50°C in forced hot air is carried out. Then, the material is subjected to a vinylchloride-vinylacetate solution, in an aromatic solvent, by adding an aluminium powder having high mirror-like properties, in order to provide the desired light reflecting capabilities. Then, desired regions of the thus obtained material will be printed upon by using a vinylchtoride-vinylacetate compound, at 77 msh, for providing a desired image which will be thermoset at 50°C in hot air. Then, the provided image will be levelled to a desired thickness, by using a solution resin of the above mentioned type, with either one or two passages at 27 msh. Then, the obtained material will be subjected to a finishing processing by using a thermotransferring solution based on vinylacetate-vinylchloride at 77 msg, thereby the printed image can be transferred under temperature and pressure on the above mentioned plastics material. From the above disclosure it should be apparent that the invention fully achieves the intended aim and objects.

Claims: A method for reproducing on a flexible film reflecting images, which can be hot transferred to a plurality of different materials, said method being characterized in that it comprises a first processing step in which a polyester film is processed by an aromatic solution of a thermoplastic resin, a second processing step in which on said film a plurality of glass beads, in an adjoining relationship are deposited, a resin priming processing step for allowing said glass beads to be locked, a further vinylchloride-vinylacetate solution in an aromatic solvent processing step by adding a metal powder having high mirror-like properties to allow said beads to refract the light, and a printing step in which desired regions are printed in colors for providing a desired image, as well as a further levelling step to a desired thickness, and a finishing processing step by using a thermotransferring solution in order to provide the printed image with the capability of being thermally transferred under pressure onto said materials. A method according to Claim 1, characterized in that said first polyester film processing step is performed by using a styrene-isoprene copolymeric thermoplastic resin having styrene contents of 15%. A method according to Claim 2, characterized in that said copolymeric styrene-isoprene thermoplastic resin is spread at 34 msh while stabilizing it at 50°C by hot air. A method according to Claim 1, characterized in that said glass beads are deposited at 77 msh and have a refracting index of 1.9 and a glass bead diameter from 40 to 60 µm [microns]. A method according to Claim 1, characterized in that said priming processing step is carried out by using an aromatic solution of a vinylchloride-vinylacetate resin with a deposition of 11.4 gm -2 [grams/m 2 ]. A method according to Claim 5, characterized in that said priming processing step comprises a thermosealing at 50°C under forced hot air. A method according to Claim 1, characterized in that said metal powder is an aluminium powder. A method according to Claim 1, characterized in that said color printing step is carried out by using a vinylchloride-vinylacetate solution with a deposition of 28 gm -2 [grams/m 2 ]. A method according to Claim 8, characterized in that said printing step is followed by a thermofixing step at 50°C under forced air. A method according to Claim 1, characterized in that said levelling step is performed by using a vinylchloride-vinylacetate resin solution either with a single or a double passage with a coverage corresponding to 94 gm -2 [grams/m 2 ]. A method according to Claim 1, characterized in that said finishing processing step is carried out by using a thermotransferring solution based on vinylacetate-vinylchloride and having a coverage capability of 28 gm -2 [grams/m 2 ].

Inventors: FERRO MARIO, FERRO, MARIO
Applicants: VENETA DECALCOGOMME S R L, VENETA DECALCOGOMME S.R.L
Application year: 1999
Main classification: B41M5
IPC codes: B41M5