Patent CH-705592-A2 (CH)
Title: Forming mechanical optical component e.g. mirror of transparent watch, by selecting optically transparent first molding material e.g. polymethyl methacrylate to form component, and selecting second material e.g. polyacryl to form layer
Inventor: POFFET CHRISTIAN
IPC: B29C45/14
Filed: 2011-10-04
Abstract: The method comprises selecting an optically transparent first molding material such as polymethyl methacrylate or polymetacrylate, Evonik Rohm (RTM: Thermoplastic methacrylate polymers), Nanocryl (RTM: Amorphous silica-nanoparticles in acrylate binder) or a polyacryl to form a multilayer component, and selecting a polymerizable second molding material such as Evonik Rohm (RTM: Thermoplastic methacrylate polymers), Nanocryl (RTM: Amorphous silica-nanoparticles in acrylate binder), polymetacrylate or polyacryl to form a layer of component. The method comprises selecting an optically transparent first molding material such as polymethyl methacrylate or polymetacrylate, Evonik Rohm (RTM: Thermoplastic methacrylate polymers), Nanocryl (RTM: Amorphous silica-nanoparticles in acrylate binder) or a polyacryl for forming a monolayer or multilayer component, selecting a polymerizable second molding material such as Evonik Rohm (RTM: Thermoplastic methacrylate polymers), Nanocryl (RTM: Amorphous silica-nanoparticles in acrylate binder), polymetacrylate or polyacryl for forming a layer of the component, forming a base body of the component, defining a number of layers superimposing the base body to obtain the component, forming a mold (9) whose contact surface (10) is negative of upper surface of the component and is a surface delimiting an interior solid volume of the component, positioning the intermediate surface at a distance corresponding to a thickness of the component, injecting the second molding material in a cavity delimited by the contact surface of the mold, polymerizing the second molding material injected in the cavity to obtain the component constituted by assembly of base body with layers, forming a layer with a new mold whose interior volume is higher than the volume of an intermediate body obtained by the mold, applying a gripping force on the mold and the base body during the injection of the second molding material in the cavity and during the polymerization of the second molding material for obtaining the component, forming a capillary network (14) of injection and degasification in the mold, and functionalizing the intermediate surface by forming a post for maintaining a connection with hollow dimension of electrified or electrifiable particles and/or magnetized or magnifiable particles. The component has an upper surface and a lower surface connected by an edge that extends according to a thickness of the component. The base body extends between a lower surface and an intermediate surface of the component, where the surfaces are connected by an intermediate edge (8). The mold comprises an edge including a bearing surface (12) arranged to cooperate with the intermediate surface. An intermediate surface of the base body and the edge are connected by the bearing surface. The second molding material is injected at a temperature of 100-120[deg] C and a pressure of 100 MPa for 10-20 seconds. After the injection of second molding material in the cavity, the intermediate body is insulated by an UV radiation to obtain the component with improved hardness. The component has a thickness of 10-50 microns.