A method for purifying powdered silicon carbide is in the form of a starting material to form a silicon carbide having a purity of at least 99.9%. This method has the following method steps: providing a starting material having a grain size of less than 100 μm and a silicon carbide content with at least 98% purity; and heating the starting material in a vacuum or oxygen-free atmosphere to a temperature above 1700° C. over a period of at least 8 minutes.

A sheet for manufacturing articles, particularly frames for glasses and the like, including at least one technical layer made of a thermoplastic material interposed between a first aesthetic layer and a second aesthetic layer, both made of a material such as fabric. A method for producing a sheet for manufacturing articles includes the steps of providing at least one technical layer made of a material such as thermoplastic polymers and at least two aesthetic layers made of a material such as fabric and associating the technical layer with the aesthetic layers. The layers are mutually compressed and then heated to obtain the sheet.

A manufacturing process and the semi-finished product of thermoplastic material obtained therefrom, for obtaining products with aesthetic patterns which can be perceived in semitransparency also in depth is disclosed. The process includes: (i) producing at least two initial elements of thermoplastic material with even but different aesthetic patterns, having a different concentration of the dominating coloring, at least the dominating coloring being of the bleeding type in the specific thermoplastic material; (ii) shaping the two initial elements into strips or loaves being of a submultiple width, not below ⅕ of a characteristic dimension of the desired finished product; (iii) inserting at least two of the strips or loaves having different concentration of the dominating coloring, into a workform, arranging them side by side according to a direction of side-by-side arrangement; and (iv) undergoing pressure and heat to allow the melting and hardening of the thermoplastic material into a single body.

Disclosed is a 3D printed eyewear frame having an integrated hinge. Advantageously, the integrated hinge assembly is a crossed spring hinge. Methods of manufacturing a 3D printed eyewear frame are likewise provided.

A method for purifying powdered silicon carbide is in the form of a starting material to form a silicon carbide having a purity of at least 99.9%. This method has the following method steps: providing a starting material having a grain size of less than 100 μm and a silicon carbide content with at least 98% purity; and heating the starting material in a vacuum or oxygen-free atmosphere to a temperature above 1700° C. over a period of at least 8 minutes.

To ease and improve the production of objects, a method is described for producing an object (60) comprising a structural core (10) and an outer coating of polymeric material (52), comprising the steps of (i) coating with polymeric material (50) a lamina (10), wherein the lamina comprises a surface exhibiting macroscopic discontinuities (32) configured so that the polymeric material grips to them in order to form a multilayered piece; (ii) removing parts from the multilayer piece to obtain a contour corresponding to the object, the contour comprising an edge (B) along which a margin of the lamina remains uncovered by the polymeric material.

A manufacturing process of, and the relative laminated, polymeric semi-finished product are disclosed, the laminated, polymeric semi-finished product having in-depth aesthetic features, including at least two mutually welded layers by a lamination process with heat and/or pressure addition, wherein at least one of the layers is a thermoplastic material, in which the following steps are provided: providing a cohesion layer 100-500 micron thick, consisting of thermoplastic polyurethane, featuring in-depth aesthetic patterns; providing polymeric sheets with materials having a softening temperature above the one of the cohesion layer; and laminating at least one of the polymeric sheets at least partly transparent or translucent with the cohesion layer, by heat and/or pressure addition suitable to reach the softening of the cohesion layer featuring aesthetic patterns.

The present invention relates to a thermoplastic laminate for an eyewear, a decorative part comprising the thermoplastic laminate and a preparation process therefor. In particular, during the preparation of the laminate, a high frequency welding machine is used for bonding thermoplastic layers. The present invention uses a high frequency welding machine for the instant welding of the thermoplastic layers. Good bonding strength exists between different layers. Further, the patterns of the core layer are intact, and have high-definition images. The patterns are located in the core layer, not affected by external environmental factors, and not easily abraded. Further, multiple surfaces of the part for an eyewear have patterns, increasing the beautiful appearance of the part for an eyewear, and meeting the requirements of customers to the largest extent.

Disclosed is a 3D printed eyewear frame having an integrated hinge. Advantageously, the integrated hinge assembly is a crossed spring hinge. Methods of manufacturing a 3D printed eyewear frame are likewise provided.

A frame for eyeglasses with color gradation, including at least one first acetate sheet having a color gradation at least on part of the first acetate sheet and a transparency along at least one second part, and at least one second acetate sheet having a color gradation on at least one part of the second acetate sheet, the first and second acetate sheets being coupled together by superimposition.