Multi-layered articles or products comprising layers of filled polymer compositions, methods of making and applications or uses thereof.

A method of making a worm gear is provided. The method comprises forming a gear hub from a powdered metal material. Thereafter an outer surface of the gear hub is sealed.

A method of making a worm gear. The method includes forming a gear blank having a plurality of individual lugs formed about an outer circumferential edge of said blank to facilitate a uniform flow of a material around said plurality of individual lugs. The method also includes molding said material around said plurality of individual lugs to form a ring.

To achieve universal welding of thermoplastic workpiece parts with simple equipment, an infrared light transmission welding method is disclosed in which simple polychromatic, incoherent infrared light is generated by a simple infrared light source and is directed through a first workpiece part to a weld point for the purposes of connection to a second workpiece part. In particular, the infrared light is directed through a transparent bracing element.

A method of forming shaped articles by welding.

A bonding method utilizing carbon nanotubes provides first and second objects to be bonded and a carbon nanotube structure. The carbon nanotube structure comprises a super-aligned carbon nanotube film comprising carbon nanotubes, the carbon nanotubes extending substantially along a same direction. The carbon nanotube structure is laid on surface of first object and surface of second object is pressed onto the carbon nanotube structure. Pressure being applied to the first object and the second object bonds the two together.

A method of making a worm gear. The method includes forming a gear blank having a plurality of individual lugs formed about an outer circumferential edge of said blank to facilitate a uniform flow of a material around said plurality of individual lugs. The method also includes molding said material around said plurality of individual lugs to form a ring.

A bonding method utilizing carbon nanotubes provides first and second objects to be bonded and a carbon nanotube structure. The carbon nanotube structure comprises a super-aligned carbon nanotube film comprising carbon nanotubes, the carbon nanotubes extending substantially along a same direction. The carbon nanotube structure is laid on surface of first object and surface of second object is pressed onto the carbon nanotube structure. Pressure being applied to the first object and the second object bonds the two together.

A structure for and method of producing large diameter seal rings. Preferred embodiments of the present invention make use of a co-extruded support layer of a polymer showing better weld quality and strength. The use of a co-extruded support polymer bonded to the functional polymer can be used to improve the strength of the entire weld, including the weld of functional polymer layer.

The present invention relates to alternative methods of joining a solid part (1) and a polymer (2). The methods comprise attaching a primer layer (4) with a predetermined surface chemistry, density and thickness covalently to at least a part of a surface (3) of the solid part (1). Some embodiments of the invention further comprise polymerizing second molecules onto the primer layer (4) so that the surface (3) is at least partly covered with surface immobilized polymer brushes (8). The surface (3) of the solid part (1) is brought into contact with the polymer (2) and a predetermined temperature profile is applied resulting in covalent bonds (6) being established between the polymer (2) and the primer (4), and/or polymer brushes (8) melting or softening and entangling with melted or softened polymer (2) so that the solid part (1) and the polymer (2) remain joined after cooling. The obtained strength of the bonding between the solid part (1) and the polymer (2) is significantly higher than if the same materials are joined with conventional methods not comprising the establishment of a primer layer (4).