Patent CH-705591-A2 (CH)
Title: Forming monolayer/multilayer component e.g. mirror of transparent watch, by selecting e.g. thermoplastic methacrylate polymer and polyacryl to form component, selecting e.g. polymethylsiloxane to obtain flexible molding, and forming plate
Inventor: POFFET CHRISTIAN
IPC: B29C45/26
Filed: 2011-10-04
Abstract: The method comprises selecting Evonik Rohm (RTM: Thermoplastic methacrylate polymers), Nanocryl (RTM: Amorphous Silica-nanoparticles in acrylate binder), a polymetacrylate, a polyacryl, or a polymerizable and a transparent first molding material for forming a monolayer or multilayer component, selecting polymethylsiloxane and a second molding material for obtaining a flexible molding for molding the first material and for demolding it, and forming a plate (6) whose contact surface (10) is negative of an upper surface of the component. The method comprises selecting Evonik Rohm (RTM: Thermoplastic methacrylate polymers), Nanocryl (RTM: Amorphous silica-nanoparticles in acrylate binder), a polymetacrylate, a polyacryl, or a polymerizable and a transparent first molding material for forming a monolayer or multilayer component, selecting polymethylsiloxane and a second molding material for obtaining a flexible molding for molding the first material and for demolding it, forming a plate (6) whose contact surface (10) is negative of an upper surface of the component, forming a flexible matrix (9) in the second molding material, forming a capillary network (14) of injection and degasification in the flexible matrix, providing bearing surface of the matrix on a support plate (15), positioning the plate with its contact surface at a distance of the first surface corresponding to a thickness of the component, injecting the first molding material through the capillary network in a cavity delimited by the contact surface of the plate, polymerizing the first material injected in the cavity until obtaining the rigid component, providing the plate and the support plate at a desired distance, detaching the component from the flexible matrix by the deformation of the plate and the support plate, applying a gripping force on the plate and support plate during the injection of the first molding material in the cavity and during the polymerization of the first molding material for obtaining the component, and inserting nodule comprising an electrifiable and/or magnetizable core, an electrified or/and magnetized core and/or an electrification or magnetization core in the cavity. The component has an upper surface and a lower surface connected by an edge that extends according to a thickness of the component. The flexible matrix comprises a first contact surface consisting of a mold and lower surface. An edge comprising a first bearing surface and a second bearing surface of the matrix is arranged around the first contact surface to cooperate, in a complementary way, with the contact surface of the plate, where the first bearing surface is placed opposite to the second bearing surface. The first molding material is injected at a temperature of 100-120[deg] C for 10-20 seconds. After the injection of first molding material in the cavity, the component is insulated by an UV radiation to obtain the component with improved hardness.