Abstract: What is described is a method of manufacturing a lens (2) for spectacles, comprising the steps of providing a lens blank (1) made from plastic material, obtaining, by cutting the blank (1), a corresponding lens having a final shape and profile suitable for mounting in a mounting frame, removing material from the lens (2) in predetermined areas of the lens to produce a first lens portion (3), inserting the first lens portion (3) into a mould (4) for overmoulding, injecting material into the mould (4) to produce at least a second lens portion (5) overmoulded on the first lens portion (3), and removing the lens (2), in which the first and second lens portions (3, 5) are integrated with one another, from the mould (4).

Abstract: What is described is a method of manufacturing a lens (2) for spectacles, comprising the steps of providing a lens blank (1) made from plastic material, obtaining, by cutting the blank (1), a corresponding lens having a final shape and profile suitable for mounting in a mounting frame, removing material from the lens (2) in predetermined areas of the lens to produce a first lens portion (3), inserting the first lens portion (3) into a mould (4) for overmoulding, injecting material into the mould (4) to produce at least a second lens portion (5) overmoulded on the first lens portion (3), and removing the lens (2), in which the first and second lens portions (3, 5) are integrated with one another, from the mould (4).

Abstract: Described herein is a process for the production of plates made of transparent plastic material with non-transparent overmoulded parts by means of a first direct injection and subsequent compression for the formation of the transparent plate, and a second injection for overmoulding said parts on the transparent plate, covering the indicators or witness marks of the first injection. Each injection can be in spots controlled in sequence, and the second injection can be followed by a respective step of post-compression.

Abstract: Described herein is a process for the production of plates made of transparent plastic material with non-transparent overmoulded parts by means of a first direct injection and subsequent compression for the formation of the transparent plate, and a second injection for overmoulding said parts on the transparent plate, covering the indicators or witness marks of the first injection. Each injection can be in spots controlled in sequence, and the second injection can be followed by a respective step of post-compression.

Abstract: A method for the production of plates of material with overmoulded parts made of plastic material of different dimensions, of shapes and colors, by means of a first injection for the formation of the plate and a subsequent injection compression for overmoulding said parts on the plate. Each injection can conveniently be performed with sequentially controlled injection spots.

Abstract: Described herein is injecto-compression moulding of articles made of plastic material with two components by means of a press of the stack-mould type in which the moulding cavity of the second component is maintained in a position of partial opening during the injection and compression of the first component within the first moulding cavity. There is moreover provided a retention system, which is associated to at least one of said first and second cavities.

Abstract: An apparatus and a process for the molding of articles made of plastic material with two components by means of a stack-mold press with a first cavity and a second cavity for the injection of the plastic material and the possible compression of the injected plastic material, in which the moulds and the countermolds of the apparatus define respective mutually facing surfaces. Parameters indicating the mutual parallelism between said facing surfaces are detected, and the closing assembly for closing the press is controlled according to the parameters detected.

Abstract: Described herein is a process for the production of plates made of plastic material by means of sequential injection with the mould half-open and a subsequent step of compression obtained by closing the mould.

Abstract: Described herein is a process for the production of articles made of plastic material, in particular transparent plates, with parts made of plastic material at least in part overmolded on The plate by means of injection-compression, excluding from the compression areas of connection between the overmolded parts and the plate.

Abstract: Described herein is injection-compression moulding of articles made of plastic material with two components by means of a press of the stack-mould type, in which the first and second countermoulds are constrained to the corresponding moulds carried by the rotating central element of the press so as to enable the respective cavities to set themselves in a position of partial opening for the injection of the plastic material within them. To both of the cavities there is then applied a closing force to bring about compression of the plastic material injected therein.

Abstract: An apparatus and a process for the moulding of articles made of plastic material with two components by means of a stack-mould press with a first cavity and a second cavity for the injection of the plastic material and the possible compression of the injected plastic material, in which the moulds and the countermoulds of the apparatus define respective mutually facing surfaces. Parameters indicating the mutual parallelism between said facing surfaces are detected, and the closing assembly for closing the press is controlled according to the parameters detected.

Abstract: Described herein are a process and apparatus for the production of articles made of moulded plastic material by means of injection or injecto-compression, in which the volume of the moulding chamber is selectively varied in a controlled way in localized areas so as to recover possible errors of dosing of the injected plastic material and completing its compression.

Abstract: Described herein is injecto-compression moulding of articles made of plastic material with two components by means of a press of the stack-mould type, in which the first and second countermoulds are constrained to the corresponding moulds carried by the rotating central element of the press so as to enable the respective cavities to set themselves in a position of partial opening for the injection of the plastic material within them. To both of the cavities there is then applied a closing force to bring about compression of the plastic material injected therein.

Abstract: A method for the production of plates of material with overmoulded parts made of plastic material of different dimensions, of shapes and colours, by means of a first injection for the formation of the plate and a subsequent injecto-compression for overmoulding said parts on the plate. Each injection can conveniently be performed with sequentially controlled injection spots.

Abstract: Described herein is injecto-compression moulding of articles made of plastic material with two components by means of a press of the stack-mould type in which the moulding cavity of the second component is maintained in a position of partial opening during the injection and compression of the first component within the first moulding cavity. There is moreover provided a retention system, which is associated to at least one of said first and second cavities.

Abstract: Described herein is a process for the production of plates made of plastic material by means of sequential injection with the mould half-open and a subsequent step of compression obtained by closing the mould.

Abstract: Described herein is a process for the production of plates made of transparent plastic material with non-transparent overmoulded parts by means of a first direct injection and subsequent compression for the formation of the transparent plate, and a second injection for overmoulding said parts on the transparent plate, covering the indicators or witness marks of the first injection. Each injection can be in spots controlled in sequence, and the second injection can be followed by a respective step of post-compression.

Abstract: Described herein is a process for the production of articles made of plastic material (1), in particular transparent plates, with parts made of plastic material at least in part overmoulded on the plate (1) by means of injecto-compression, excluding from the compression areas of connection (3, 4) between the overmoulded parts (2) and the plate (1).